Final answer:
A line of broken dashes separates lanes of traffic moving in the same direction, aiding in safe lane changes on roadways.
Step-by-step explanation:
A line of broken dashes is used to separate lanes of traffic moving in the same direction. In most cases, these lines are meant to indicate areas where vehicles can change lanes safely. This is opposed to solid lines, which suggest that lane changes are either unsafe or prohibited. Understanding these traffic patterns and road signals are essential for safe driving and are part of the rules of the road. When you encounter zigzagged paths, as mentioned in Figure 3.2, they often occur within city driving where roads may not be straight, requiring drivers to follow a more complex path. On highways, however, movement tends to follow straight lines and the lane demarcations are clearly marked by dashes.