Benefit

V2I data used to support adaptive signal control networks can reduce delay up to 30 percent in scenarios with greater than 60 percent CV market penetration.

The benefits of early deployment of connected vehicle infrastructure at signalized intersections was simulated and explained to help state and local agencies.


January 2018
McLean; Virginia; United States


Summary Information

Connected vehicle technology, a USDOT major research initiative, brings unparalleled safety benefits and holds promise to alleviate traffic congestion and environmental impacts to future transportation systems.

In this research paper, a connected vehicle infrastructure framework was presented in five steps.
  1. Upstream detectors were used to collect upstream arrival vehicle profiles for each approach and Basic Safety Messages (BSMs) were transmitted to Roadside Units (RSU) and forwarded to the model.
  2. Upcoming traffic data was predicted based on real-time traffic data. The predicted traffic data for a signalized intersection included incoming traffic demands, vehicle queue length of all phases, and average approach travel time, etc.
  3. Based on predicted data, splits were adjusted to clear the queues on all approaches. In the state of practice approach, cycle length was adjusted based on the critical intersection method.
  4. Alternatively, cycle length and offset were optimized to minimize queue lengths of all phases at all intersections.
  5. The adjusted splits, optimized offsets and cycle length were implemented for all signalized intersections
The framework was simulated on a network modeled after four signalized intersections along Dolley Madison Boulevard in McLean, VA. The Virginia Department of Transportation provided the Synchro file that the traffic signal timing plan had been optimized to. Connected vehicle penetration rates simulated included: 10 percent, 25 percent, 50 percent, 60 percent and 70 percent.

Findings

When the connected vehicle penetration rate was over 60 percent, adjusting splits and optimizing offset and cycle length reduced the delay on major roads by 30 percent and the delay on the minor roads by 8 percent.

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Source

Benefits of Early Deployment of Connected Vehicles at Signalized Intersections

Author: Zhang, Li et al.

Published By: Transportation Research Board

Source Date: January 2018


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Goal Areas

Mobility

Typical Deployment Locations

Metropolitan Areas

Keywords

traffic signals, adaptive signals

Benefit ID: 2018-01266