Transit signal priority uses GPS devices on buses to send a signal to a traffic management center, which can then either hold a green light as the bus approaches or shorten the amount of time a bus is stopped at a red light.
According to NYC DOT, the technology has sped bus trips between 10 and 18.4 percent. A recent evaluation of signal priority on the M15 Select Bus Service [PDF] said “the system is working well… [and] the city has the option to deploy citywide.” The problem is that only a handful of routes are outfitted with TSP.
The city’s 2011 PlaNYC update set a goal of adding transit signal priority to 11 routes citywide, but didn’t set a target completion date. So far, the city and the MTA have rolled out transit signal priority on just three corridors. Seven routes remain in various stages of planning or study.
New York’s first TSP system was installed at 14 intersections along Staten Island’s Victory Boulevard in 2008. Signal priority cut bus travel times by 16 percent during the morning rush hour and 11 percent during the evening [PDF], and 19 additional intersections on the route are in line to get it.
The city’s first Select Bus Service route, the Bx12 on Fordham Road, received TSP later in 2008, covering 35 intersections over 2.4 miles between Broadway in Manhattan and Southern Boulevard in the Bronx.
Since then, the only route to receive upgrades has been the M15 SBS, which in May 2013 received signal priority for 50 buses and 34 intersections along 2.2 miles of its route south of Houston Street. The M15 was the first in the city to use newer technology that communicates with the traffic management center, the MTA says, with Victory Boulevard and Fordham Road relying on older “line of sight” devices.
Bus riders on other routes are still waiting for improvements, in some cases years after blown deadlines.