Problem statement : Simulation of traffic flow at a junctionSoftware Used : NETLOGO 3.0.2
Why Traffic signaling ? ● Fast factsAn average Indian in metros spends 6 days in an year intraffic jams37% of the road accidents in India are due to impropertraffic control . Courtesy : wikipedia
Why Traffic signaling ?The initial cost of installing traffic signal is justified by ● The saving in time ● Reducing anxiety ● Eliminating manual effort.Need to design an optimum system to meet individualjunction needs.
DESIGN OBJECTIVES :● Must be simple● Easily adaptable to the existing traffic conditions at the junction● Must provide the quickest possible clearance to vehicular and pedestrian traffic in all directions● Must be flexible enough to take care of change in the traffic density and character with time.
● The equipment must be easy to start, operate and maintain● Withstand severe weather conditions and supply voltage fluctuations.● Careful study and analysis of the traffic flow at the required junction is carried out beforehand to select the most economical system.
Our Model :Quick view ● Simulates a busy traffic intersection in which the vehicles come from the four directions namely East, West, North and South. ● Aims to avoid accidents and to manage the waiting times of the vehicles ● Includes as many real time inputs as possible.
Assumptions:Each direction of traffic junction has two lanes.Each square patch (Netlogo term) can be empty or occupiedby exactly 1 vehicle. All vehicles are of same size is assumedimplicitly here.Explicitly forbids collisions and overtaking.Pedestrians and Vehicles obey traffic signals (at least up to athreshold time). This is OK because they are not made to waitindefinitely.
vehicles :Allowed to come from the four directions.Randomly move towards any of the other three directionsFrequency of vehicles on each of the 4 directions is adjustableTry to move to the patch ahead on each time-step and remainwhere they are if the patch ahead is occupiedor if the traffic signal prevents them from moving.Stop when the signal is red BUT up to a limited time beyondwhich they lose patience.
Vehicles at a traffic light about to enter the intersection willnot do so only if there are not more than a specified amountof cars already in the intersection area.While a vehicle is stopped its wait-time counter increases by1 every time-step.
Pedestrians: Also come from the four directions Cross the road only when all the signals are red (pedestrian signal on) When the PEDESTRIAN switch is on or their count crosses a given threshold the signal favors pedestriansGraphs/Monitors :The monitors show the number of vehicles waiting on eachdirections and also their avg speeds.The throughput graph shows the number of vehicles that crossthe junction in given time. The aim is maximize this.
Whats New?● Adaptive to the vehicle frequency in switching the lights.● No indefinite waiting.● Provision for pedestrians● Monitoring vehicle throughput● Considers the number of waiting cars in every direction and signals adjust themselves to reduce this.