What does 'Box junction- you MUST NOT enter the box until your exit road or lane is clear' mean?

The phrase 'Box junction- you MUST NOT enter the box until your exit road or lane is clear' specifically means that a driver should remain outside the box junction until they can proceed through it without stopping. This rule is essential to ensure that traffic flows smoothly and prevents congestion. If drivers enter the box without the ability to clear it, they may block other vehicles from moving, which can lead to gridlock and obstruct traffic.

Understanding this regulation helps maintain order on the roads, especially in busy intersections. The requirement emphasizes the importance of forward planning when approaching a box junction—drivers must assess the situation ahead to ensure they can continue moving without interruption.