Question

A single broken ________ line shows traffic flowing in opposite directions.

Answer 1

This doesn't really fall under the topic of mathematics, but still, I'm going to help you.
A single broken yellow line shows traffic flowing in opposite directions. This type of line is often seen on two lane rural roads. A single broken white line shows traffic flowing in two lanes in the same direction, as opposed to the yellow line.

Answer 2

Answer:

yellow line

Explanation:

The flow of cars within a road can be represented by either of two ways:

1- single broken white line:

This indicates that the flow of cars in both lanes is in the same direction

2- single broken yellow line:

This indicates that the flow of cars in both lanes is in opposite directions

This can be simply visualized using the attached image where the green arrows indicate the direction of the movement of cars.

Hope this helps :)