Showing papers on "Rear-end collision published in 2013"

Rear end collision prevention apparatus

Abstract: A rear end collision apparatus. The rear end collision apparatus includes a first warning light to capture a driver's attention indicating a slow down or stop event is about to occur or is occurring and re-focuses a drivers' visual attention point and a different type of second warning light indicating the vehicle has not yet started re-accelerating after a slowing or stop event. The rear end collision prevention apparatus may be integrated into a Center High Mount Stop Lamp (CHMSL) on a vehicle or used as a separate apparatus. The read end collision apparatus helps reduce or prevent rear end collisions of vehicles and reducing or preventing driver acclimatization to warning lights in a CHMSL or other rear end collision warning lights.

Analysis of the role of inattention in road crashes based on naturalistic on-board safety monitoring data

Abstract: The general objective of the present analysis was to investigate the role of driver inattention in rear-end crashes and crossing path intersection crashes. To this end, a set of 133 naturalistic crashes (70 rear-end and 63 intersection crashes), obtained by means of the DriveCam on-board safety monitoring (OBSM) system, were analyzed based on a novel methodology for assigning and aggregating crash-contributing factors. The analysis focused on rear-end crashes where the OBSM-instrumented vehicle was striking a lead vehicle and crossing-path intersection crashes where the driver of the instrumented vehicle intended to proceed straight through the intersection. It was found that driver inattention, in particular driver distraction involving a diversion of gaze from the forward roadway, was the dominating factor contributing to the rear-end crashes. Although driver inattention also contributed to the intersection crashes, the patterns of contributing factors for this crash type were quite different compared to the rear-end crashes. In particular, in the intersection crashes, visual occlusion and insufficient selection of safety margins were identified as key contributing factors. Cognitively distracting activities that did not involve a diversion of gaze from the forward roadway, such as cell phone conversation, did not contribute frequently to avoidance failures for any of the crash types. The present results show that the role of driver inattention as a crash-contributing factor depends strongly on the type of crash. They also support previous findings from naturalistic driving studies that visual diversion from the forward roadway is the key mechanism by which inattention leads to rear-end crashes.

Rear end collision early warning method based on vehicular networking technology

Abstract: The invention discloses a rear end collision early warning method based on a vehicular networking technology. The method comprises the steps of obtaining peripheral vehicle node GPS (global position system) data (comprising ground course angle and longitude and latitude coordinate information) through vehicular networking real-time communication and obtaining speed information from a CAN (control area network) bus, computing and judging the positional relation among vehicle, and further judging whether the risk of rear end collision exists. The method provides an effective solution for the problem of the potential driving risk of rear end collision in conditions of high-speed driving or blurred vision caused by weather reason.

Fault tree analysis of train rear-end collision accident considering common cause failure

Abstract: Along with the development of modern design technology and the increasing complication of modern engineering systems, component dependency has become a universal phenomenon during the failure analysis of systems. Ignoring the dependency among the failure behaviors of system components may lead to a huge error or even yield faulty results. In this paper, three types of models and two kinds of modeling methods are introduced for solving the common cause failure issues. The fault tree model of the train rear-end collision accident has been proposed based on the explicit modeling method. The probability of occurrence of the train rear-end collision accident is calculated using the square root model. The result shows that common cause failure has significant influences on the system reliability.

Rear-end collision real-time prediction method aimed at frequently jammed section of expressway

Abstract: The invention discloses a rear-end collision real-time prediction method aimed at a frequently jammed section of an expressway. Firstly, a traffic flow detector used for collecting real-time traffic flow data of all sections of the expressway is installed on the expressway (generally the upstream section of a bottleneck area). When a rear-end collision occurs, vehicle following running tracks are analyzed, a rear-end collision risk real-time prediction logistic model of the frequently jammed section of the expressway is built, and model parameters are calibrated according to traffic flow data by five minutes before the collision occurs. The method overcomes the defect that effective real-time prediction of the rear-end collision of frequently jammed section of the expressway cannot be conducted in the past, rear-end collision risks can be estimated in real time according to the traffic data collected by the traffic flow detector on the expressway, and moreover, dynamic traffic control is utilized to control and prevent the rear-end collision. The method has important time application value and wide application prospects in China.

Early warning and protection system for rear-end collision in expressway and control method

Abstract: The invention discloses an early warning and protection system for rear-end collision in an expressway and a control method. The early warning and protection system comprises a driver road condition selection module, an environmental monitoring module, a master control module and an execution module. Driver road condition selections comprise a dry road surface, a wet road surface and an ice and snow road surface. A driver selects corresponding switch positions according to the practical road surface situations, a laser range finder measures the distance between a vehicle of the driver and a rear vehicle in real time; a real-time critical safety following distance obtained according to the distance information, speed information of the vehicle, and the road surface selection switch position information is compared with the measured practical following distance; and a high brake lamp and an active safety headrest trigger unit are turned on according to the danger level. The early warning and protection system reduces the probability of rear-end accidents in the expressway to the greatest extent, and minimizes injuries of drivers and passengers when the rear-end accidents happen.

A Survey on Rear End Collision Avoidance System for Automobiles

Abstract: Collision warning and collision avoidance systems are emerging automotive safety technologies that assist drivers in avoiding rear-end collisions. Their function is to allow the driver enough time to avoid the crash and yet avoid annoying the driver with alerts perceived as occurring too early or unnecessary. The purpose of this paper is to review various mechanisms under development or developed rear end collision avoidance of automobiles. Some of the reviewed work include an automatic braking system that safely stops an automobile while approaching an obstruction to avoid collision. Another separate but related system is to have a detection device, which alerts the driver in case the automobile veers off the road by crossing either the centre or side painted lines. The braking system senses an obstacle, calculates the relative distance and applies the variable brakes automatically to maintain a safe distance. Warning devices and sensor mechanisms used in obstacle avoidance systems are also reviewed. Language: en

Automobile rear-end collision early-warning method and system

Abstract: The invention discloses an automobile rear-end collision early-warning method and system, and belongs to the field of automotive active safety. The method comprises the following steps: obtaining current vehicle speed information, receiving current vehicle location information transmitted by a global positioning system, wherein the location information includes latitude, latitude and a ground heading angle, receiving other vehicle speed information and location information within a predetermined range, judging that whether the current vehicle is in the same road with other vehicle or not, whether the current vehicle is in the same direction with the other vehicle or not, determining the safe distance between the current vehicle and the other vehicle, calculating the actual distance between the current vehicle and the other vehicle, and comparing the safe distance and the actual distance, and determining that the current vehicle and the other vehicle can suffer from rear-end collision when the current vehicle and the other vehicle are in the same road and the in the same direction. According to the technical scheme of the invention, the cost is low and the precision is high.

Microcontrollers based rear-end anti-collision warning system for vehicles

Abstract: Now a day’s vehicle accident is becoming critical issue allover the world and in Ethiopia in particular that demands engineer’s endeavor to find ways to minimize the incidence. The application of electronic systems embedded in automobile is expected to contribute a lot on the race to minimize vehicle accident disaster. Thus, the research focused on developing a model of rear end anti-collision warning system that will detect the distance between two vehicles moving on the same lane in the same direction and alert the driver whenever she or he is in danger range using microcontroller (PIC).

The ADAC advanced emergency brake system test - a real life based approach for a better primary safety

Abstract: Rear-end collisions are the most frequent same and opposite-direction crashes Common causes include momentary inattention, inadequate speed or inadequate distance While most rear-end collisions in urban traffic only result in vehicle damage or slight injuries, rear-end collisions outside built-up areas or on motorways usually cause fatal or serious injuries Driver assistance systems that detect dangerous situations in the longitudinal vehicle direction are therefore an essential safety plus In view of this, for ADAC, systems that alert drivers to dangerous situations and initiate autonomous braking complement ESC as one of the most important active safety features in modern vehicles The aim of ADAC is to provide consumers with technical advice and competent information about the systems available on the market Reliable comparative tests that are based on standardised test criteria may provide motorists with important information and help them make a buying decision In addition, they raise consumer awareness of the systems and speed up their market penetration The assessment must focus on as many aspects of effectiveness as possible and include not only autonomous braking but also collision warning and autonomous brake assist The work of the ADAC accident research is the development of the testing scenarios with direct link to accident situations and the identification of useful test criteria for testing (A) Paper to the session "Aspects of Driver Assistant Systems" of the 5th International Conference on ESAR "Expert Symposium on Accident Research", 7th to 8th September 2012 in Hannover

Rear-end collision preventing system of rail train

Abstract: The invention discloses a rear-end collision preventing system of a rail train, which comprises a wheel axle impulser on a train wheel, wherein the wheel axle impulser is used for collecting impulses generated by rotation of a wheel axle On the train, the rear-end collision preventing system comprises a positioning module, a first communication module, a second communication module, a spacing calculation module, an alarm module and a brake module, wherein the positioning module is connected with the wheel axle impulser and used for calculating the position of the train; the first communication module is used for sending position information of the train to the next train; the second communication module is used for receiving position information of the previous train; the spacing calculation module is connected with the positioning module and the second communication module and used for calculating the distance between two trains; the alarm module is connected with the spacing calculation module and used for sending alarm information when the distance between the two trains is less than a first preset value; and the brake module is connected with the spacing calculation module and used for emergency braking when the distance between the two trains is less than a second preset value By using the system, a certain safe distance can be kept between the two trains which drive on a railway front and back, so as to avoid rear-end collision of the trains

Early warming and protection system of rear-end collision on highway

Abstract: The utility model discloses an early warming and protection system of a rear-end collision on a highway The early warming and protection system of the rear-end collision on the highway comprises a driver road condition selection module, an environment monitoring module, a master control module and an implementation module The driver road condition selection comprises three selection conditions including a dry road, a wet road and an icy road A driver selects a corresponding switch position according to a practical road surface condition and measures an interval between a self automobile and a back automobile in real time through a laser range finder, compares a real-time critical safe interval which is obtained according to interval information, speed information of the self automobile and road selection switch position information with a measured practical interval, and controls turning-on of a high mount stop lamp and starting of an active safe headrest trigger unit according to the danger degree According to the early warming and protection system of the rear-end collision on the highway, probability of occurrence of the rear-end collision on the highway can be reduced to a maximum extent, so that harms, to drivers and passengers, happening when the rear-end collision occurs can be reduced to the lowest level

Method and device for controlling rear-end collision of vehicles in time of tire burst

Abstract: The invention discloses a method and a device for controlling rear-end collision of vehicles in time of tire burst A self vehicle is provided with a transverse angular velocity sensor and a vehicle speed sensor and comprises tire pressure detection modules, a controller, a first wireless transceiver module and a rear vehicle detector, wherein each tire pressure detection module is arranged in a corresponding tire, the first wireless transceiver module is arranged in a carriage and used for receiving tire pressure signals, and the rear vehicle detector is arranged at the rear portion of the carriage Each tire pressure detection module comprises a microprocessor, a second wireless transceiver module and a sensor module The controller is electrically connected with the tire pressure detection modules, the first wireless transceiver module, the vehicle speed sensor, the rear vehicle detector, the transverse angular velocity sensor, a brake generating device and a vehicle power system By the method and the device, the vehicle self can be controlled to be braked to slow down in time of the tire burst according to the speed of the same and the rear vehicle as well as the distance from the rear vehicle

Rear body structure of vehicle

Abstract: PROBLEM TO BE SOLVED: To effectively absorb a collision load input in the case of a rear end collision of a vehicle, and to effectively protect a power auxiliary engine arranged in front of a tire pan.SOLUTION: A rear body structure of a vehicle including a pair of right and left rear side frames 1 and a trunk floor panel 2 and provided with a downward recessed tire pan 3 at a rear part of the trunk floor panel 2 has a cross member 8 which is installed on a front side of the tire pan 3 and connects the right and left rear side frames 1, and a power auxiliary engine 10 which is arranged on the cross member 8 to be supported. A tire 4 is installed in a falling state in the tire pan 3, and the cross member 8 is installed apart above the trunk floor panel 2. Installation heights of the cross member 8 and tire 4 are set respectively so as to move the tire 4 to a vehicle front side along a lower surface of the cross member 8 in the case of the rear end collision of the vehicle.

Rail train rear-end collision preventing system based on opened frequency band communication

Abstract: The invention discloses a rail train rear-end collision preventing system based on opened frequency band communication, and the rail train rear-end collision preventing system is characterized in that a train wheel comprises a wheel axle pulse sensor for collecting pulse generated by the rotation of a wheel axle; and a train comprises a positioning module, a first wireless digital transmission module, a second wireless digital transmission module, a distance calculation module, a warning module and a brake module, wherein the positioning module is connected with the wheel axle pulse sensor and used for calculating a position of the train; the first wireless digital transmission module is used for transmitting position information of the train to a train behind the train through a wireless signal of an opened frequency band; the second wireless digital transmission module receives the position information of a train in front of the train through a wireless signal of the opened frequency band; the distance calculation module is used for calculating the distance between two trains; the warning module is used for issuing alarm information when the distance of the two trains is less than a first preset value; and the brake module is used for emergency braking when the distance of the two trains is less than a second preset value. Through the rail train rear-end collision preventing system, a certain safe distance can be maintained between a front train and a behind train, which run on a rail, while the communication cost is saved and the communication stability is improved, and the rear-end collision accident of trains can be avoided.

Rear-end collision preventing system using a camera

Abstract: PURPOSE: A rear-end collision prevention system using camera is provided to prevent a rear-end collision due to this object by filming the front and/or rearward of a vehicle through a camera and grasping the access speed of an object approaching a vehicle through a photographed image. CONSTITUTION: A rear-end collision prevention system using camera(1) comprises a front camera(3), a car speed detecting unit(5), an image processor(7), a braking unit(9), and a control unit(11). A front camera films the front of a driving vehicle. A car speed detecting unit senses the car speed of a vehicle. An image processor measures the access speed at the critical location of an object approaching vehicle by analyzing the image of a front of a vehicle which is filmed with a front camera. A braking unit puts the brake on a vehicle by operating when the access speed of an object measured at an image processor is over the setting value. A control unit controls a front camera, a car speed detecting unit, an image processor, and a braking unit according to the data received from an image processor and a car speed detecting unit.

Rear-End Collision: Causes and Avoidance Techniques

Abstract: Rear-end collision is one of the most frequent accidents occurring on roadways. This chapter investigates how vehicle’s local parameters in a platoon of cars (i.e., perception and information collection, vehicle speed, safe distance, braking parameters) affect the global behavior of the traffic system in terms of rear-end collision avoidance (CA). In fact, microscopic car following models capture the tactical maneuvering decisions of drivers, in order to maintain a safe distance and avoid collision with the lead vehicles. Furthermore, the chapter describes how vehicle-to-vehicle (V2V) wireless communication networks can be used in preventing rear-end collisions. Finally, as an example, the design and evaluation of an adaptive inter-vehicle CA communication protocol is provided. This protocol is capable of maintaining high reliability and efficiency in the face of large variations in vehicular traffic and wireless network conditions.

Rear-end collision-resistant alarm device for high-speed railway vehicle

Abstract: The utility model discloses a rear-end collision-resistant alarm device for a high-speed railway vehicle, wherein a signal transmitter on a vehicle timely transmits signals with different frequencies to the periphery, the other vehicles receive the signals, the possibility of the rear-end collision between the two vehicles is determined according to the different coverage ranges which correspond to the different frequencies and the vehicle running information data included in the signals, and alarm information is sent. The rear-end collision-resistant alarm device disclosed by the utility model is simpler to install, and is practical in function, the running direction of the vehicle can be distinguished according to the covering ranges of different signals with different frequencies, the distance between the two vehicles and the possibility of the rear-end collision danger can be computed, the drivers in the front vehicle and the back vehicle can be informed and reminded by a displayer, an optimal safety running suggestion scheme can be given to be selected by the drivers, and an early warning signal can be transmitted to a dispatching center. After the device is used, the reliability of a metro control system can be effectively improved, the happening of the rear-end collision can be avoided, the running safety can be guaranteed, and a timely, exact and reasonable running suggestion can be provided to the drivers in a cab, so that the condition of the rear-end collision can be avoided.

Apparatus for reducing damage to vehicle at rear-end collision

Abstract: PROBLEM TO BE SOLVED: To provide an apparatus for reducing damage to a vehicle at a rear-end collision, which absorbs impact energy due to a rear-end collision between a vehicle and another vehicle by cushioning, and prevents or reduces damages at the rear-end collision.SOLUTION: A shock absorber 11, which can be extended and contracted between a deployment position where it protrudes rearward beyond the rear end of a vehicle 1 and a storage position forward of the deployment position, is fixed between a rear underrun protector (RUP) 4 and an RUP bracket 5. When another vehicle collides with the vehicle 1 from the rear and load is input to the RUP 4, the shock absorber 11 is contracted forward and absorbs the impact energy of a rear-end collision by cushioning. In the case of a comparatively slight rear-end collision where impact energy is almost absorbed until the shock absorber 11 is contracted up to a contraction limit position located between the deployment position and the storage position, the contraction of the shock absorber 11 is limited by the contraction limit position, so that damages to the vehicle 1 and another vehicle at the rear-end collision can be prevented.

Intelligent translational energy absorption seat used for self adaptation during rear-end collision

Abstract: The invention relates to an intelligent translational energy absorption seat used for self adaptation during a rear-end collision. In case of an accident, the intelligent translational energy absorption seat works as follows: a collision sensor mounted on the seat transmits information to a processing device according to the detected collision degree; the processing device processes the information, transmits an instruction to motors, controls the motors to rotate, and further drives sliding blocks to slide; when the collision sensor detects a high-speed rear-end collision, the motors rotate to drive the sliding blocks to slide, and the sliding blocks extrude energy absorbing steel sheets, so that the energy absorbing steel sheets are subjected to plastic deformation, the constraint platform force is further improved, and the seat is enabled to slide backwards steadily so as to protect a passenger from being injured in the neck. The intelligent translational energy absorption seat is suitable for three working conditions, namely low-speed rear-end collision, medium-speed rear-end collision and high-speed rear-end collision, and can provide larger constraint platform force for the high-speed rear-end collision.

Initiative rear-end collision avoiding device for vehicles

Abstract: The utility model discloses an initiative rear-end collision avoiding device for vehicles The initiative rear-end collision avoiding device for the vehicles comprises a controller, a vehicle distance detection module, a warning module and a switch which are electrically connected with each other by getting a power source of a vehicle The vehicle distance detection module which is arranged at the tail part of the vehicles transmits signals and parameters detected according to the setting to the controller in time The controller orders the warning module in time to make an instant and corresponding warning inwards or outwards the vehicles or inwards and outwards of the vehicles simultaneously according to the setting conditions Different warnings are set when the space between one vehicle and the vehicle driving behind changes along with changing speed The initiative and effective warning in advance can help a driver and the driver driving behind to handle correctly so as to avoid a rear-end collision well, an accident and the like

Vehicle regulating and controlling method based on reduction of vehicle rear-end collision accident number

Abstract: The invention discloses a vehicle regulating and controlling method based on reduction of a vehicle rear-end collision accident number. The method comprises a first step of obtaining information of a road section where a rear-end collision accident happens, a second step of collecting traffic data of the road section where the rear-end collision accident happens before the accident happens, a third step of collecting the traffic data of the road section where the rear-end collision accident happens in a normal state, a fourth step of building a traffic data total sample, a fifth step of building a standardized rear-end collision accident discrimination function, and a sixth step of detecting a discrimination function value of road section rear-end collision accident occurrence and regulating and controlling vehicles; a seventh step of repeating the sixth step, and conducting the detection of discrimination function value of road section rear-end collision accident occurrence at a next set time T in a road section to be tested, and conducting vehicle regulation and control until the detection is finished. According to the vehicle regulating and controlling method based on the reduction of the vehicle rear-end collision accident number, traffic flow parameters are obtained by using a traffic flow detecting device, and the discrimination function values of the rear-end collision accident occurrence on freeways are detected in real time, and regulation and control to vehicles are achieved, and the number of traffic accidents is reduced.

Study on Modeling and Simulation of Vehicle Safety Distance in Low Speed for Rear-end Collision Avoidance

Abstract: Rear-end collisions of low speed vehicles on the urban road are common accident scenarios. A judgment of safety distance is a crucial part of a rear-end collision avoidance system which relies on safety distance model. In order to solve the problems of traditional safety distance models, this paper proposes a new model to avoid rear-end collisions. The new model considers the braking performance of the host vehicle and the motion state of the heading vehicle. Then a rear-end collision avoidance system including the new model is established using a combination of CarSim with Simulink software. Three typical working conditions through the co-simulation is simulated for verifying the model. Simulation results show that the new model ensures rear-end collision can be avoided, meanwhile keeping a short relative distance that improves road efficiency.

Real-time prediction of rear-end crashes near freeway recurrent bottlenecks

Abstract: To predict the real-time collision risk for rear-end crashes at freeway recurrent bottlenecks,in this study,the features of trajectories of individual vehicles when encountering kinematic waves were investigated,the collision conditions were analyzed,aggregate analysis of the trajectories of multiple vehicles was conducted.Then a model to predict the collision risks was developed using aggregated traffic flow data.Results show that the rear-end collision probability during propagation of kinematic waves was significantly related to the collision risk index and standard deviation of upstream occupancy.The model was used to predict the collisions in the bottleneck section of a real-world freeway;the predictions were consistent with observations.The highest collision risk occurs when traffic changes from free-flow to congested states.The propagation of kinematic waves in congested traffic also increases the rear-end collision risk.

Crash test using a car with automatic pre-crash braking

Abstract: The utilisation of secondary safety systems to protect occupants has attained a very high level over the past decades. Further improvements are still possible, but increasingly minor progress is only to be obtained with a high degree of effort. Thus, a key aspect must be the impact to overall safety in an accident. If reliable information is available on an imminent crash, measures already taken in the pre-crash phase can result in a significantly great influence on the outcomes of the crash. With this background preventive measures are the key to a sustainable further reduction of the figures of crash victims on our roads. This paper aims to show a preventive approach that can contribute to lessening the consequences of a crash by creating an optimum interaction of measures in the fields of primary and secondary safety. To further enhance vehicle safety, driver assistant systems are already available that warn the driver of an imminent front-to-rear-end crash. The next step is to support him in his reactions or if he fails to react sufficiently, to even initiate an automatic braking when the crash becomes unavoidable. Automatic pre-crash braking can, in an ideal situation, fully prevent a crash or can significantly reduce the impact speed and thus the impact energy (and the severity of the accident). If a vehicle is being braked in the pre-crash phase, the occupants are already being pre-stressed by the deceleration. The information available about the imminent crash can be used to activate the belt tensioners and likewise other secondary safety systems in the vehicle right before the impact. The pre-crash deceleration also causes the front of the vehicle to dip. Conventional crash tests do not take this specific impact situation into consideration. This is why, for example, the influences of the pre-crash displacements of the occupants are not recorded in the test results. Furthermore, a reproducible representation of the benefit of the vehicle safety systems which prepare the occupants for the imminent impact is not possible. In order to demonstrate the functions of automated pre-crash braking and to investigate the differences during the impact as a consequence of the altered occupant positions as well as the initiation of force and deformations of the vehicle front, DEKRA teamed up with BMW to carry out a joint crash test with the latest BMW 5 series vehicle. It involved the vehicle braking automatically from a starting test speed of 64 km/h (corresponding to the impact speed set by Euro NCAP) down to 40 km/h. The test was still run by the intelligent drive system of the crash test facility. This required several modifications to be made to the test facility as well as to the vehicle. The paper will describe and discuss some relevant results of the crash test. In addition, the possible benefits of such systems will also be considered. The test supplemented the work of the vFSS working group (vFSS stands for Advanced Forward-looking Safety Systems). (A) Paper to the session "Aspects of Driver Assistant Systems" of the 5th International Conference on ESAR "Expert Symposium on Accident Research", 7th to 8th September 2012 in Hannover.

Vehicle rear-end collision preventing system

Abstract: The utility model relates to a vehicle safety system, in particular to a vehicle rear-end collision preventing system The vehicle rear-end collision preventing system comprises a controller module The controller module is provided with an MCU, a controller Bluetooth module and an acceleration sensor The vehicle rear-end collision preventing system further comprises an ultrasonic probe, an instrument panel and a smart mobile phone According to the vehicle rear-end collision preventing system, the ultrasonic radar technology is applied to the vehicle-mounted field, the shorter distance of a vehicle provided with the vehicle rear-end collision preventing system and a vehicle in front can be measured well by the ultrasonic distance measurement technology, the detection distance and various early warning information reminders are output to the terminal of the smart mobile phone and displayed for reminding a driver by connecting the Bluetooth of an ultrasonic radar controller and the Bluetooth of the smart mobile phone of the driver in a pairing mode, and finally early warning of rear-end collision prevention is achieved

Warning system for preventing rear-end collision

Abstract: The utility model discloses a warning system for preventing a rear-end collision, aiming to provide the warning system for preventing the rear-end collision, according to the warning system, a distance with a rear vehicle can be displayed and reminded for a driver, and thus the driver is facilitated to control a vehicle distance. The warning system comprises a distance measuring unit which is used for measuring the distance with the rear vehicle, a control and analysis unit and a display unit which is used for displaying the distance with the rear vehicle, the control and analysis unit is connected with the display unit, and a trigger is arranged between the distance measuring unit and the control and analysis unit. Under the circumstance of insufficient light in the evening or lower visibility due to bad weather, by the adoption of the warning system, the driver is provided with information on an accurate distance with the rear vehicle, and thus the driver is facilitated to control the vehicle distance.

Rear-end collision prevention intervention belt

Abstract: The invention relates to a rear-end collision prevention intervention belt, and belongs to the field of roadway safety facilities. The rear-end collision prevention intervention belt comprises a base plate (1), wherein a plurality of concavo-convex points (2) are uniformly distributed on the base plate (1), and reflection layers are arranged on the concavo-convex points (2). When a vehicle is out of order and forced to stop on the high way, as long as the device is taken out to be put within a safe distance behind the vehicle, when other vehicles arrive, the device warns drivers through the physical contact between the device and the running vehicles. Particularly, during a long drive or fatigue driving, the general alarm warming probably does not have strong effectiveness, but the vehicle bumpiness generated by the physical contact can allow the drivers to quickly regain consciousness, and therefore accidents are prevented.