How do stoplights work?
There are two different types of stoplights in Idaho : fixed time and traffic response. Fixed time stoplights assign the green light to the different approaches of an intersection for a predetermined amount of time. Some can also be set to different lengths of green time during peak traffic hours. These types of signals are typically found in urban areas where traffic movement is fairly predictable. Traffic responsive signals change the lights according to the amount of traffic in each direction. These signals use sensors to detect the amount of vehicles and automatically adjust the length of the green time. This allows as many vehicles as possible through the intersection before responding to the presence of vehicles approaching from another direction.
