On a two-lane road, when can you pass another vehicle on the right?

Passing another vehicle on the right is permissible when the driver you are passing is making a left turn. This situation occurs because the left-turning vehicle is maneuvering into the nearby lane, and as long as it is safe to do so and you can see that there is enough space, you can legally and safely pass on the right side.

This rule helps maintain safety on the road by allowing a clear path when another vehicle is momentarily occupying the left lane. Being aware of the motion of other vehicles and executing the pass with caution is essential in these scenarios.

The other choices do not provide contexts or conditions under which passing on the right is legally acceptable or safe, making them inappropriate in this context. For instance, speeding is irrelevant to the legality of passing and could be dangerous. The absence of oncoming traffic does not inherently justify passing on the right; instead, it simply may indicate safe passing conditions in certain contexts. Similarly, no posted signs against passing may indicate that passing is generally allowed, but specific situations like left turns are more definitive for when passing on the right is appropriate.