Final answer:
Broken white lines on roads with multiple lanes in each direction allow for lane changes among traffic moving in the same direction. They promote organized traffic flow and indicate that crossing into another lane is permissible.
Step-by-step explanation:
Where there are two or more lanes of traffic in each direction, a broken white line is used to indicate lanes of traffic moving in the same direction. These lines are designed to guide drivers and indicate that changing lanes is allowed, as opposed to a solid white line which suggests that lane changes should generally be avoided. The broken white lines also help in the organization of traffic and ensure a smoother flow by defining lanes clearly.
For example, on a highway, you'll find these broken white lines separating lanes of traffic going in the same direction, and vehicles may cross these lines when trying to change lanes. It is crucial for drivers to make sure the lane they are moving into is clear of traffic before crossing a broken white line.