The Traffic Accident Reconstruction Origin -Article-

Two Green Lights

You arrive at a major intersection to find a collision between a north and eastbound vehicle. The intersection is controlled by a traffic signal. This traffic signal has lights for vehicles traveling straight through in all directions. It also has left turn arrows for traffic traveling in all directins.

Both drivers state they had a green light.

The traffic box that controls the signals contains the equipment in Figure 1 below.

Figure 1

Figure 2

1. What are the major components contained in this traffic box?
2. What, if anything, does the diagram mean?
3. Given the equipment in this box is it possible that both drivers had a green light?
4. Given the equipment in this box is it possible to determine what color the signal was at the time of the collision?

Copyright ©