I'll try to explain this again...
1/29/2019 at 2:02 PM
someguy said "The last poster is saying exactly what I’m thinking. They are quite a bit out of sync and the lights should change to yellow when the timer is done I think. If not that, then at least have some consistency. Why even have them if they’re going to be that wonky? "
Not all intersections are the same. When entering a larger intersections, say that have boulevards in the median, the counter will end before the yellow light comes on. This has an effect on the driver that makes gives them an extra second or two to safely stop, rather than having less reaction time for the deeper intersection, thus resulting in fewer traffic collisions. They can't increase the length of the yellow light, because that doesn't effect the driver's response, people will always drive through and even after a yellow light. But the counter has been shown to make drivers actually approach the intersection with more cognitive response, rather than just tramping down on the pedal as soon as they see a yellow light. If you notice, the longer the turning lane at an intersection, the longer the delay between the "0" and the yellow. This essentially helps clear the intersection before the advance arrow comes up. Next time have a look around at what intersection you are at when you notice the delay...they're usually at the larger, busier intersections.