When can you legally pass another vehicle on the right?

Passing another vehicle on the right is legal in certain situations, and one of those scenarios is when the driver of the vehicle you are overtaking is making a left turn. This is permissible because the vehicle is momentarily obstructed in its lane due to the turn, creating an opportunity for other drivers to safely pass on the right, assuming there is enough space and it is safe to do so.

When considering other options: multiple lanes may allow for passing on the right under certain circumstances, but it depends on the specific configuration of those lanes and the state laws; however, it's not a definitive rule like the one pertaining to a left-turning vehicle. The legality of passing at night doesn't inherently provide justification for passing on the right, as this depends more on visibility and safety. Lastly, passing below the speed limit is not a legal basis for passing on the right; speed limits are established for safety and do not relate directly to the actions of overtaking. Thus, the appropriate context for passing a vehicle on the right is indeed when the driver is making a left turn.