Optimization of green-times at an isolated urban crossroads

Abstract

We propose a model for the intersection of two urban streets. The traffic status of the crossroads is controlled by a set of traffic lights which periodically switch to red and green with a total period ofT . Two different types of crossroads are discussed. The first one describes the intersection of two one-way streets, while the second type models the intersection of a two-way street with an one-way street. We assume that the vehicles approach the crossroads with constant rates in time which are taken as the model parameters. We optimize the traffic flow at the crossroads by minimizing the total waiting time of the vehicles per cycle of the traffic light. This leads to the determination of the optimum green-time allocated to each phase.

Optimized traffic flow at a single intersection: traffic responsive signalization

“…Concerning the above consideration, during one hour, the average number of entering cars are approximated by N in = 3600 ∆ λ A . Avoiding the occurrence of growing queue, leads to the satisfaction of the following constraint 24 :…”

Autonomous Decentralized Control of Traffic Signals that can Adapt to Changes in Traffic

“…Autonomous decentralized control, in which adaptive and resilient macroscopic behavior emerges through the coordination of simple individual components, may be the key to adapting to unpredictable changes in the amount of traffic. Thus, several decentralized control schemes have been proposed so far [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. A typical example is the selforganizing traffic signal (SOTL) method [10][11][12][13][14][15][16][17][18][19], where each traffic signal is controlled by several local rules such that the traffic signals can immediately adapt to the current situation.…”

A Strategy to reduce air pollution for Homogeneous lane following traffic system – An Indian Scenario

“…Better traffic control leads to improved safety for all road users, shorter travelling times through the controlled part of the traffic system and it also reduces negative environmental impact [1]. One of the important issues is the optimization of traffic lights in urban road networks [6], especially the coordination of vehicle flows and traffic lights. A typical goal is to minimize travel times, to find optimal cycle times [5,6] and to study the corresponding spatio-temporal patterns of traffic flow [7]- [9].…”

“…The unmeasured inputs and outputs introduce non deterministic factors. The flow splits can be measured or estimated but cannot be controlled in an acceptable manner [1][2][3][4][5][6][7][8]. So in this paper we have proposed a different approach to reduce waiting time of vehicles by introducing "shortest job first scheduling" with the existing method of traffic movement.…”