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How does transit signal priority work?

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Public transport vehicles are prioritized at traffic signals. Transit Signal Priority fits well with other priority options currently running, such as bus lanes, priority means, and more.   The primary purpose of priority for public transport at traffic signals are: Reduce the time taken to pass through crossings - Buses and trams pass through many signalized crossings. Calculating the total delay at all the crossings can add many minutes to the overall trip time. It is one of the significant causes of passenger frustration and increased operating costs. The objective is to align the bus with the green time better and thereby decrease delays. Reduce the change of time taken to pass through a crossing - The amount of time passing through the intersection depends on whether the signal is green or red. It may need extra time to be added to the schedule, thus adding to resource costs. Minimization of variance is often the main reason