When is it legal to overtake a vehicle on the left?

Overtaking a vehicle on the left is legal when the vehicle in front is signaling to turn right. This situation indicates that the vehicle is preparing to make a turn, and overtaking on the left allows the driver behind to safely pass without interfering with the intended turn. This maneuver is considered safe and legal since it helps maintain traffic flow and reduces potential hazards.

In contrast, it is not legal to overtake on the left if the vehicle is not signaling a right turn, especially in situations where the vehicle might be preparing to change lanes or make other maneuvers that could lead to conflicts. Additionally, overtaking on a one-way street usually allows for more freedom, but it is still essential to follow traffic rules and ensure safety. Thus, understanding the context of when vehicles signal is crucial for safe driving practices.