One of the goals of RapidRide is to reduce travel time for passengers by at least 25 percent along the corridor. Metro will use a number of techniques to meet this goal, including signal priority and signal coordination.

Signal priority is the use of a wireless Intelligent Transportation System to give buses more “green time” at traffic lights. For the A Line, Metro will use signal priority at 20 intersections along Pacific Highway S/International Blvd. The system can extend a green light by 5-12 seconds, depending on the time of day, to give an approaching RapidRide bus (and the traffic around it) an extra shot at getting through the light.

Signal coordination makes traffic flow more smoothly along the length of the corridor. With the A Line, this means coordinating traffic signals managed by four different cities (SeaTac, Kent, Des Moines, and Federal Way).

The entire RapidRide corridor is covered by a wireless network that’s reserved for public agencies. This network connects buses, bus stops, traffic signals, and Metro’s central computer system, allowing them all to work together.

Photo: electronic gear in cabinet
Here's a peek inside one of the plain steel cabinets that will give the red buses a little extra "green time."