A grid of yellow markings painted on the ground indicates...

Correct answer

that we must not enter the intersection if we may be stopped in it, obstructing traffic.

A grid of yellow markings painted on the ground, generally at intersections, indicates that we must not enter the intersection if there is a possibility of being stopped inside it and thereby obstructing traffic. This type of marking, known as a “yellow box” or “box junction”, is intended to keep traffic flowing and prevent junctions from becoming blocked. The criss-crossed yellow lines remind drivers of the importance of not entering the junction unless they can cross it completely without stopping. This means that, even if a traffic light is green or we have right of way, we must not move into the intersection if traffic is congested and there is a risk of being immobilised there.