Programmed Flash ends at some intersections

Change at four intersections on Wellesley

Julie Happy, 509.625.7773,

Friday, December 11, 2015 at 1:21 p.m.

The City will be terminating programmed flash – setting traffic signals to flash during early morning hours – at four intersections on Wellesley.

Programmed flash will be eliminated at the following intersections beginning Monday, Dec. 14:

  • Ash and Wellesley
  • Maple and Wellesley
  • Monroe and Wellesley
  • Wall and Wellesley

Vehicle detection systems were recently installed at each intersection, so programmed flash is no longer needed to facilitate traffic flows. Vehicle detection allows the signals to respond promptly to vehicle demand. The system will allow for more efficient service during low volumes times when programmed flash was previously used (1 a.m. to 5 a.m. weekdays and 2 a.m. to 5 a.m. on weekends).

Eliminating programmed flash also provides for 24/7 operation of pedestrian signals at those intersections. Pedestrian signals do not work during programmed flash.