Page 34 - Trafficinfratech Magazine April 2023 Digital Edition

PUBLIC TRANSPORT

data, the arrival time of buses at the
Remote Control Centre stop bar is predicted and new signal
timings are calculated in each cycle.
The sensors used are indigenously
developed and customized to
Traffic State Bus Local Signal meet the bus priority application
(Wi-Fi RSU Controller specifications. The present model
sensor) (OBU) considers total person delay of all
vehicles that arrive at an intersection
in a signal cycle. The delay functions
The OBU consist of GPS, solution. For signal information, were multiplied by a weighting
accelerometer and gyroscope, direct information from the signal factor, which is the vehicle occupancy
and the data will be used for controller can be utilised. in this case.
communicating bus arrival As buses have the highest
information at signalized Thus, the 3 key inputs for the occupancy, the weighing factor will
intersections via RSU (V2I). system include: prioritize buses over other vehicles in
Application for data transfer 1. Bus arrival information: the signalized intersection. The base
between RSU to server (with captured using DSRC devices signal system is developed based on
public IP) was also developed vehicle delay minimization at the
based on socket communication 2. Traffic state information: intersection. The developed bus
through internet. An elemental realized through probe vehicles priority algorithm is computationally
architecture diagram of Bus Priority using Wi-Fi scanners light making it scalable. Thus, this
System (BPRS) using DSRC devices 3. Real time signal information: solution, aimed to promote public
is depicted in Figure below. For transport by reducing total person
the traffic data collection, the less obtained from traffic controller delay at signalized intersections, is
infrastructure intensive Wi-Fi sensors Based on the bus and signal data a step towards the development
are developed indigeneously at and the computed traffic flow and of sustainable transportation
IIT Madras and utilised for the queue length using Wi-Fi sensor solutions.

34 TrafficInfraTech / April 2023 / www.trafficinfratech-com-500653.hostingersite.com