Michigan Commercial Driver's License (CDL) Practice Exam

What should you do when approaching a traffic light that has been green for an extended period?

1. Speed up to pass before it turns yellow

2. Start to slow down

3. Maintain your speed

4. Prepare to signal right

The correct answer is: Start to slow down

When approaching a traffic light that has been green for an extended period, starting to slow down is the most prudent action. This approach enhances safety by preparing the driver for the possibility that the light may turn yellow or red. A prolonged green light could indicate that a change is imminent, especially if the light has been green longer than usual for the flow of traffic. By slowing down, the driver allows themselves the ability to stop safely if the light changes, minimizing the risk of running a red light, which can lead to accidents. This also provides time to observe any changing conditions at the intersection, such as pedestrians, cross traffic, or vehicles that might not be stopping. Maintaining speed could lead to situations where a rapid decision might need to be made if the light changes unexpectedly, and speeding up can lead to running a red light, while signaling right may not be necessary unless turning is intended and safe. Thus, reducing speed is the most responsible choice in this scenario.