Showing papers on "Traffic congestion reconstruction with Kerner's three-phase theory published in 1975"
TL;DR: A queueing theory approach in which vehicles are allowed to have physical dimensions yields the platoon length distribution, the delays to fast vehicles, the headway process and the flow density diagram for both the space and time processes.
17 citations
01 Jul 1975
6 citations
TL;DR: A basic model for two-dimensional time-dependent traffic flow is formulated and it is found that under standard assumptions as to routing and the location of trip end points, a strong peak hour occurs in the form of a shock wave.
Abstract: In this paper we formulate a basic model for two-dimensional time-dependent traffic flow. The model is designed specifically to relate to the morning peak period of commuter traffic, for which the underlying ideas are relatively unencumbered. The time variation of the point value of the “travel intensity at a given time point” is considered and also the global “wave movement” that peak hour traffic will exhibit—the peak hour will not be entirely synchronous at all points over the city. It is found that under standard assumptions as to routing and the location of trip end points, a strong peak hour occurs in the form of a shock wave. The effect of changes to the routing system and trip-end distribution is also considered.
6 citations
Journal Article•
TL;DR: A generalised equation relating the traffic flow to concentration is derived, which leads to a new definition of traffic congestion detectable through the measurement of average vehicle speed or concentration.
Abstract: A generalised equation relating the traffic flow to concentration is derived. The equation, which leads to a new definition of traffic congestion detectable through the measurement of average vehicle speed or concentration, may be used in on-line traffic control systems. (A) /TRRL/
2 citations
01 Mar 1975
TL;DR: A microprocessor has been developed for use both in and outdoors for different levels of traffic control, such as isolated intersections, sub-areas and areas, which handles complex multiphase intersections up to 32 signal groups in different modes of operation.
Abstract: A microprocessor has been developed for use both in and outdoors for different levels of traffic control, such as isolated intersections, sub-areas and areas. A detailed description is given of the all purpose traffic controller 86 AD 190 which handles complex multiphase intersections up to 32 signal groups in different modes of operation. As a master controller 87 AD 146, the system performs coordination and supervision of a number of intersections in a sub-area. On area level the 83 AD 147 version of this system supervises and monitors a number of master controllers and their associated local controllers in different sub-areas. /TRRL/
1 citations
Journal Article•
TL;DR: A methodology is presented that uses both field studies and traffic simulation for developing delay-based traffic signal warrants, based on a competition between two types of intersection control: traffic signals and two-way stop signs.
Abstract: A methodology is presented that uses both field studies and traffic simulation for developing delay-based traffic signal warrants. The field studies were performed to confirm the validity of the UTCS-1 simulation program. These warrants are based on a competition between two types of intersection control: traffic signals and two-way stop signs. Several of the worst common right-angle inter- section configurations were analyzed over the entire spectrum of traffic volumes on their approaches. Analysis of the results led to the definition of criteria, based on volume and delay considerations, for selecting the appropriate type of control. The resulting warrants are expressed in graphical format, and accompanying specifications are given.