Passing a vehicle on the right is permissible when that vehicle is making a left turn or when you are on a one-way street. This is due to the fact that when a vehicle is preparing to turn left, it creates an opportunity for drivers to safely pass on the right side if there is enough room. In scenarios where drivers are traveling on a one-way street, all lanes of traffic are moving in the same direction, allowing for safe passing on either side, provided it does not conflict with traffic laws or obstruct other vehicles.
In contrast, while there could be situations where parked vehicles may influence the flow of traffic, such instances are not a justification for passing on the right. Similarly, in construction zones, the rules regarding passing can be more restrictive, focusing on safety rather than allowing for the convenience of passing in that area. Lastly, simply having a clear road does not inherently justify passing on the right without specific conditions being met that ensure safety and adherence to traffic laws.