Wireless Sensor-Based Traffic Light Control

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Wireless Sensor-Based Traffic Light Control

• Malik Tubaishat, Qi Qi, Yi Shang, Hongchi Shi

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Problem Statement

• Comparison of performance of wireless sensor
  based networks(Single sensor and dual sensor)
  with fixed traffic cycle TLC.
• Non-Occupancy Detection(NOD) and Occupancy
  Detection(OD) based comparision
• Effect of sensor distance on Average waiting
  time.

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Results

• Used GLD(Green Light District) for their
  simulation
• Implemented Fixed Light controller, Single Sensor
  based and Fixed Sensor based
• Some values
• Random Spawn Frequency 0.1-0.35
• Cycle length 5000 averaged over 5 cycles.

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• (a) urban-like map and (b) downtown-like map

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• One Sensor- Urban Network

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• One Sensor- Downtown Network

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Key take-aways

• Two Sensor Model outperforms one Sensor Model
• Two sensor model performance is close to best
  ?rst which knows the exact number of waiting
  vehicles.
• OD model, the closer the sensor to the
• junction the better the performance is.

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Sensor Placement in Real-Time Sensor Based
Traffic Light Control

• Infrastructure Based Controllers
• Performance based Measurements
• Control Decision through Sensor data

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Outline

• Agent based Controllers
• Learn the expected waiting times of vehicles and
  set the traffic lights accordingly
• Infrastructure Based Controllers
• Change the traffic flow based on the current flow
  of Traffic
• They basically know the queue length and act on
  this information

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List of Controllers

• Random Switched Traffic at Random
• Most Cars Move lanes regardless of the queue
  length
• Best First Give priority to lanes with
  maximum length
• Longest Queue Selects only the lane with
  maximum length
• Relative Longest Queue No. off road users is
  divided on the basis length of the lane to get
  relative rewards for traffic light settings

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Control Decision Through Sensor Data

• One Sensor Based Controller
• NOD-Non-Occupancy Based Detection
• OD-Occupancy Based Detection

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• Two Sensor-based Controller

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• The Gain Value is the queue length for
  infrastructure-based TLC.
• In every cycle the TLC adds the gain value for
  the possible sign con?gurations and selects the
  sign con?guration with the maximum gain value

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Future Work

• Focus work more towards increasing the life time
  of sensors
• Study performance in realtime with smaller
  intervals.

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Reference

• Wireless Sensor-Based Traf?c Light Control, Malik
  Tubaishat, Qi Qi, Yi Shang, Hongchi Shi, Consumer
  Communications and Networking Conference, 2008.
  CCNC 2008. 5th IEEE

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• Thank You
• -Questions...