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... 1 There are many external factors that contribute to delay and unreliability of bus transit, including several factors related to traffic and traffic control devices such as traffic signals. Transit signal priority (TSP)
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... 2 Transit Signal Priority: Current State of the Practice or both. There are some exceptions, and some TSP systems used a combination of business rules with varying parameters to help make TSP work as well as possible within the unique operating environments at each intersection.

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