Advance Bus Detection Strategy Using Peer to Peer Signal Communication - City of Calgary

Various technologies are available for bus early detection and each comes with own limitations. Loops and cameras are conventional but expensive solutions if detection needs to be provided further away from signalized intersection. Centralized Transit Signal Priority (TSP) is an accurate and feasible solution that can detect a bus far away from an intersection and is able to communicate the bus arrival to the downstream signal controller. The City of Calgary is in the process of deploying this Centralized TSP system, but timelines of the implementation is unknown at this time. A temporary solution for this is to provide advanced bus detection based on the bus travel time and peer-to-peer signal communication. The objective of this study is to test this advanced bus detection technology in a small section of Transitway as a pilot project. The Transitway is a new facility that provides a dedicated right-of-way for Calgary Transit (CT) vehicles which has eliminated the queue related delays. However, bus travel time is not reliable enough due to several reasons. For this pilot study a peer-to-peer signal controller communication was established where the upstream intersection can place a call to the downstream intersection once a bus leaves the intersections. The call is essentially based on bus detection at the upstream intersection and the estimated travel time. This advanced bus detection strategy has been evaluated based on field observations and data from signal controllers. It is expected that the advance detection pilot study based on peer-to-peer signal communication will reduce bus signal delay and improve travel time with no additional infrastructure cost. The findings from this study can potentially be applied to the upcoming new Transitway upon successful pilot.


Recorded Jan 14 2020