Delaware Defensive Driving Practice Test

What does a double solid white line prohibit?

1. Crossing

2. Lane changing

3. Stopping

4. Turning

The correct answer is: Crossing

A double solid white line primarily indicates that crossing the line is prohibited, which means that drivers should not change lanes when they encounter this type of marking on the roadway. This restriction is intended to promote safety by keeping traffic flowing in a controlled manner, especially in situations where lane changes could pose risks, such as in high-traffic areas or when approaching intersections. While lane changing is not permitted across a double solid white line, it is also important to understand that this kind of line serves as a strong visual cue to reinforce orderly driving behavior. The presence of a double solid white line suggests that conditions are not ideal for changing lanes, leading to increased awareness for drivers to remain in their designated lane. Other options, such as stopping or turning, may not be directly forbidden by a double solid white line, but the primary purpose of this marking is to prevent lane changes. Understanding the implications of road markings like this is crucial for maintaining safety on the road.