Traffic Signal Timing
Dilemma Zone: Scenario 1 Page 147
The animated space-time diagram on the next page shows a delayed driver's reaction when approaching the intersection with a yellow light.

Three curves are depicted:

  • The curve denoted by the continuous line shows the delayed reaction of the driver. As a consequence of this delay the car will not able to stop comfortably before the stop line.

  • The curve denoted by bigger dots shows the driver's decision of continuing through the intersection. The car will cross the intersection violating the red light.

  • The curve denoted by smaller dots shows the decision of braking and stopping comfortably before the stop line.