Combined Optimisation of Traffic Signal Settings and Geometric Junction Layouts with Reverse Lane Usage

Project: Research

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Description

Conventional traffic signal design methods including the stage-based and group- (phase-) based approaches focused on signal timings optimisation. More recently, the lane-based design method introduced the lane markings, showing road users the permitted turning movements on traffic lanes, as binary variables into the design framework to enable better land area usages. However, the numbers of approaching and exit lanes prescribing the overall junction geometric layouts have to be given as constant parameters excluding from the optimisation procedures. New integer variables and relevant governing constraints will be added to streamline existing formulations to offer flexibilities in dealing with different traffic patterns. It is expected that, if the middle lanes in the arms of a junction can be reversed to be approaching lanes in one period but exit lanes in another for controlling the varying traffic, further enhancement could be observed. The design problems of junction capacity maximisation, total delay minimisation, and cycle length minimisation supporting all the new design features can be formulated as Binary-Mix-Integer- Linear-Programs and Binary-Mix-Integer-Non-Linear-Programs which are solved by standard branch-and-bound technique and efficient line-search heuristics, respectively. Traffic surveys will be conducted to collect traffic data and geometric information. Simulation model will be employed to demonstrate the before-and-after improvements.

Detail(s)

Project number9041261
Grant typeGRF
StatusFinished
Effective start/end date1/01/081/03/11