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Pages 3-10

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From page 3...
... 3 C H A P T E R 1 Background Public transit buses face many operational challenges -- especially when operating on the same streets and roads as other vehicles. Buses can be slowed by traffic congestion and get repeatedly caught at traffic lights, slowing buses down and delaying both passengers on board and passengers waiting at stops farther along the route.
From page 4...
... 4 Transit Signal Priority: Current State of the Practice Definition of Terms Different TSP terminology is used by different authors and transit agencies. For consistency, the following definitions will be used in this report: • TSP system: the hardware and software components and modules that work together to make TSP work.
From page 5...
... Introduction 5 • TSP benefits, challenges, and lessons learned: What benefits do transit agencies observe from their TSP deployments? And what challenges and lessons learned from current TSP deployments can provide much-needed insight for the rest of the industry?
From page 6...
... 6 Transit Signal Priority: Current State of the Practice a detector, a priority request server, and a signal controller. The detector's role is to identify when there is a bus that wants priority and estimate when it will arrive.
From page 7...
... Introduction 7 Figure 1. Diagrams illustrating types of priority.
From page 8...
... 8 Transit Signal Priority: Current State of the Practice in Figure 1b, where the bus is arriving near the end of the opposing phase and could save some signal delay by requesting priority. Note that this priority request would have to be sent well in advance for the signal to safely terminate the opposing phase and pass the bus through as shown.
From page 9...
... Introduction 9 • Minimum schedule deviation, • Minimum headway deviation, • Minimum passenger load, and • Bus door status (e.g., open or closed)
From page 10...
... 10 Transit Signal Priority: Current State of the Practice Table 1. Case example agency key operational statistics.

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