When is it permissible to enter a box junction?

Entering a box junction is permissible only when your exit road is clear. This rule is in place to ensure that vehicles do not block the junction, causing congestion or obstructing other road users. When you approach a box junction and the exit is clear, you can safely enter without causing any obstruction, allowing for the smooth flow of traffic.

If you enter the junction when your exit is not clear, you may end up stopping in the middle of the junction, which can lead to delays and potentially dangerous situations for other drivers and pedestrians. This is why the clear exit condition is emphasized in traffic regulations regarding box junctions. It promotes safety and efficiency on the roads.

In contrast, entering a box junction whenever it feels safe or as a warning to other drivers disregards the fundamental rule regarding the junction's purpose and can lead to confusion and accidents. Similarly, only entering during emergencies may not be relevant in everyday driving conditions.