I'm amazed at how many drivers are clueless to the sensors and will stop beyond the stop line, thus never triggering them. Or well before the stop line at some intersections.

I faced this often at one intersection I encountered daily while driving. At the bottom of a hill, many drivers would stop too soon and never trigger the light. Which would otherwise stay red forever. In a car, I'd ultimately have to go around them and just run the red light. Otherwise, I'd sit there forever.