scholarly journals Evaluation of Transit Signal Priority on Arterial Performance - A Comparison between Conventional and Unconventional Intersection Operation

2021 ◽  
Vol 9 (5) ◽  
pp. 1615-1626
Author(s):  
Taqwa Alhadidi
Keyword(s):  
Transit Signal Priority ◽  
Intersection Operation ◽  
Arterial Performance

scholarly journals Arterial Performance Measures in a Connected Vehicle Environment

2020 ◽  
Author(s):  
Noah J. Goodall ◽  
Brian L. Smith ◽  
Ramkumar Venkatanarayana
Keyword(s):  
Performance Metrics ◽  
Lateral Acceleration ◽  
Connected Vehicle ◽  
Transit Signal Priority ◽  
Traffic Calming ◽  
Arterial Performance ◽  
Data Elements ◽  
Measures Of Effectiveness ◽  
Point Detection ◽  
Regulation Compliance

Wireless communication between vehicles and the transportation infrastructure will provide significantly more timely and comprehensive information about arterials and their performance. However, most measures-of-effectiveness were developed based on data available from traditional “point” sensors. The information made available in a connected vehicle environment requires new metrics that can fully utilize the data. This paper identifies several new arterial performance metrics made available in a connected vehicle environment, as well as several existing metrics that can be evaluated more accurately and frequently than before. The new metrics are person-delay, sudden deceleration, change in lateral acceleration, and aggregate regulation compliance. Person-delay measures a vehicle’s lost time multiplied by the number of passengers, and allows for more efficient movement of high-occupancy vehicles and sophisticated transit signal priority. Sudden deceleration and change in lateral acceleration measure activities such as unexpected braking and swerving, which may be leading indicators of unsafe conditions. Aggregate regulation compliance detects unsafe driving behavior that is difficult to collect in the field, such as speeding and illegal U-turns. Engineers can address problem areas through signal timing changes traffic calming, and other measures. The proposed metrics all require high-resolution detection, and are difficult or impossible to measure with existing point detection. For each new metric, its compatibility with connected vehicles is discussed, and required SAE J2735 DSRC Message Set Dictionary data elements are identified.

San Pablo, California, Corridor Rapid Service

2017 ◽  
Vol 2647 (1) ◽  
pp. 17-25
Author(s):  
Peter Martin ◽  
Nathan Landau
Keyword(s):  
Travel Time ◽  
Lessons Learned ◽  
Bus Rapid Transit ◽  
Transit Signal Priority ◽  
Rapid Transit ◽  
East Bay ◽  
Years Of Service ◽  
Bus Service

The San Pablo, California, Rapid bus service was planned 17 years ago and was implemented 13 years ago. The Rapid service, which did not include exclusive lanes, was an upgrade of previous limited-stop bus service linking the East Bay communities of San Pablo, Richmond, El Cerrito, Albany, Berkeley, Emeryville, and Oakland. The 13 years of service provide some lessons for other communities that are considering moderate (or less than full) service upgrades to bus rapid transit. The service was quick to implement and low in cost, but it has not provided the anticipated ridership benefits. The upgrades apparently were not significant enough to attract ridership increases. The transit signal priority element was not well maintained and thus has not provided the desired travel time and reliability benefits. AC Transit—which operates the service—and the corridor communities are currently reexamining further upgrades to the service. This Rapid service is well used, but more pronounced improvements are needed to fulfill ridership potential in the corridor. The lessons learned are that minor upgrades can be easily implemented, but noticeable changes are required to achieve significant ridership gains.

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