Traffic lights

A Traffic light is a signaling device positioned at a road intersection. It allows for Cars and Pedestrians to cross an intersection in a timely safe manner.

Dynamic Lights
Dynamic Lights are able to change when a car is present.

Induction Loop
Induction loops embedded in the streets are able to detect a car's presence which can dynamically trigger a traffic light.

The Induction loops from previous lights can be used as an approximation for other intersections along the same street. Especially during rush hours, most cars are headed in the same direction. Speed data maybe able to be collected from 2 or more inductance loops in a row, but knowing the distance between the two loops and the time between detection currents from the loop.

GPS
Using Data gathered from a car's Gps, the light can be changed green for the car approaching the intersection.