When can you legally overtake another vehicle?

Overtaking another vehicle is legally permissible when there are no oncoming vehicles, as this ensures safety for all road users. This context implies that there is a clear lane available for overtaking without the risk of colliding with approaching traffic. It highlights the importance of assessing road conditions, ensuring that there is sufficient visibility and space to execute the maneuver safely.

In contrast to the other options, overtaking at traffic signals may not be safe or legal, as intersections can be busy and unpredictable. Similarly, overtaking in pedestrian zones is prohibited to prioritize pedestrian safety, as these areas are intended for foot traffic. Lastly, the idea of being able to overtake on any street at any time disregards the need for safe conditions and the rules of the road, which are designed to protect all drivers and pedestrians. Thus, the correct approach to overtaking relies heavily on the absence of oncoming vehicles to ensure a safe passage.