There is a built-in system for stoplights when traffic starts to pick up, usually during the morning and evening rushes and at noon, he said. Also, ironically, vehicles can have a direct impact on why some red lights are longer than others. Crouch said there are sensors in the pavement at an intersection. If a driver has a long light, sometimes it is just as easy to blame the first car as it is to blame the traffic cruising on the busier street. There are ways to counter the long stoplight problem.
Some emergency vehicles are able to trigger stop lights.
Although four-way stops seem to be sparingly used, they still serve a convenient purpose. Such stops cannot handle lots of traffic, they save time when a balanced flow of traffic is coming from each way. Blinking lights are rarely seen on busy streets but can help solve the traffic light problem nonetheless. Also, when a driver is at a long light, a natural tendency is to turn right on red. However, this is not allowed in some cities.