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Adaptive Transit Signal Priority (TSP) on corridors with vehicle detection can limit bus delays and mitigate impacts on cross street traffic.
Simulation study comparing active versus adaptive transit signal priority (TSP) in Canada.
Date Posted
06/30/2014
Canada
Canada
Development and Evaluation of an Adaptive Transit Signal Priority Control with Updated Transit Delay Model
Summary Information
This study compared the performance of adaptive transit signal priority (TSP) to active (conventional) TSP using a simulation model to represent typical traffic conditions on a 7.4 kilometer section of a bus corridor in Edmonton, Alberta, Canada. Previous research showed that active TSP can improve bus travel times, but sometimes at the expense of cross street traffic. In this study, researchers examined how advanced vehicle detection, if available on a corridor, can be used to support adaptive TSP and improve overall corridor performance.
METHODOLOGY
To evaluate performance a full-scale signal simulator (ASC/3) was integrated with VISSIM and the following three scenarios were modeled.
A statistical study (t-test) was conducted to assess the significance of improvement by the proposed adaptive TSP.
FINDINGS
The results indicated that adaptive TSP can significantly outperform active TSP by dynamically managing control delay on bus approaches and non-bus approaches.
To evaluate performance a full-scale signal simulator (ASC/3) was integrated with VISSIM and the following three scenarios were modeled.
- Baseline conditions (Current signal timing without TSP.)
- Active TSP (Current signal timing with active TSP that provides a 10-second maximum green extension and 5-second guaranteed green on other phases).
- Adaptive TSP (Current signal timing with adaptive TSP that balances improvements in bus travel times against long delays on individual approaches to each intersection.)
A statistical study (t-test) was conducted to assess the significance of improvement by the proposed adaptive TSP.
FINDINGS
The results indicated that adaptive TSP can significantly outperform active TSP by dynamically managing control delay on bus approaches and non-bus approaches.
- Adaptive TSP can limit bus delay while maintaining an acceptable level of service to all traffic on all approaches.
Development and Evaluation of an Adaptive Transit Signal Priority Control with Updated Transit Delay Model
Development and Evaluation of an Adaptive Transit Signal Priority Control with Updated Transit Delay Model
Source Publication Date
01/16/2014
Publisher
Paper presented at the 93rd Annual Meeting of the Transportation Research Board, 12-16 January 2014
URL
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