These are Semi-actuated signals– there are vehicle and pedestrian detectors to cross the main street only. The signal will display green minimum time along the main street then responds to any side street actuations. An actuation may be a result of either a vehicle detected or a pedestrian pushing the button.  Should a vehicle only be detected, the signal will change to green a minimum of 7 seconds for the side street and extend should further vehicles be detected. The pedestrian “walk” will only be displayed by pushing the pedestrian push button  Example: Paisley Road at Silvercreek Parkway North