Showing papers on "Traffic count published in 1979"

Estimating origin-destination matrices from traffic counts: a simple linear intercity model for quebec

Abstract: This paper presents a linear model to estimate an intercity origin-destination matrix from volume counts on network links. It is argued that the use of a single impedance term in the assignment procedure and the taking into account of heteroscedasticity of the residuals circumvent some of the difficulties presented by o-d estimation problems. Indirect evidence from residuals of the linear model and from A gravity format suggest that significant non-linearities are present in the data set and could be isolated if the present state of techniques permitted to distinguish between the functional form of a model and heteroscedasticity of the residuals.(a) (TRRL) terminology. The guide is the first of a series of four consecutive guides to information searching on roads and traffic. The other guides describe secondary sources of information, original publications, and producers of information on roads and traffic.

Labour-saving methods for counting traffic movements at three- and four-arm junctions

Abstract: In order to obtain an automatic count of vehicles making specific turning movements off a highway, observers are usually employed to record the route that each vehicle takes. The article describes a method of obtaining a traffic count by the suitable placing of automatic counters so that the number of observers can be reduced. It is shown that by choice of option and use of local knowledge or historic information, good estimates or even 100% accurate results can be obtained without using one observer per arm of a junction. /TRRL/

A microprocessor-based system for traffic data collection

Abstract: The design, construction and operation of a portable, self-powered, microprocessor-based traffic data collection system is described. The system is based on the Golden River MK4 range of equipment, and allows for input from automatic sensors and coded input from several observers. Data are passed by the processor to an audio-grade magnetic tape cassette in a compact form, and may be read via a 300-baud uart port into a main-frame computer store for analysis. (a) /TRRL/

Demand and the planning of cycle tracks along main roads and other highways

Abstract: In Lower Saxony in 1976 special provisions were made for increasing road safety on the highways. Provision was also made for the increased construction of cycle tracks, which had become necessary due to the increase in the use of bicycles both for going to school and for recreational purposes. A method is developed for drawing up demand and priority plans for cycle tracks along main roads and other roads, which may also be used in built up areas. A prerequisite for planning is the collection of data regarding traffic, accidents and the structure of bicycle traffic. The evaluation in regard to demand and priority is achieved by means of a point system. (TRRL)

Traffic engineering, an introduction. second edition

Abstract: The author outlines the purpose of traffic engineering, why it is necessary and discusses detailed aspects of its study. An account is given of the methods available for several different types of traffic surveys. These include counting techniques used for the measurement of traffic flows, static and mobile methods of the measurement of speeds and delays, and the study of the use and effectiveness of parking schemes. A section on traffic control includes discussion on the use of one-way systems, segregation measures, markings and signs. The control of intersections is examined together with methods and effects of on-street and off-street parking. Methods of forecasting future travel demands such as the furness technique, and the 'gravity model' are explained and related to traffic designs together with other aspects of traffic flow. Current designs of car parks and intersections are discussed with examples of their application. Factors involved in accidents, including road layout, skid resistance and vehicle/pedestrian segregation are explained. Methods of monitoring and analysing accident records are discussed. A chapter is included on the function and design of street lighting. Basic statistical methods used in traffic engineering are outlined. (TRRL)