The term “transit signal priority” (TSP) doesn’t sound too exciting; It’s a rather forgettable phrase. Easier to get excited about bike lanes, car share and Hyperloop as new transportation ideas than TSP. But, after a few months of becoming familiar with the idea, I now see why TSP and dedicated transit lanes are key to improving urban mobility today. When I talk about efficiency, I am referring to people’s time, pocket books, and energy use. According to TransitWiki: “TSP are operational improvements in the public transportation infrastructure that reduce dwell time at traffic lights for transit vehicles by holding green lights longer or shortening red lights.” In other words, Buses and trains get their own lights, with their own timing.
From what I’ve gathered, TSP exists in Boston in two parts of town: along several intersections of the Silver Line Bus route and at four intersections of the Bus 57 route. But the impact of TSP on bus service in these areas is minimal as the lights only speed up bus service when they are behind schedule (according to an Urban Liberty article). This adds predictability to my commute but does not help reduce the current wide gap that exists between car and bus commutes in the city.