The **yellow road marking** formed by squares indicates to drivers that **they must not enter that area** if there is a possibility of being stopped and obstructing traffic. This signal is crucial to avoid traffic blockages, especially at intersections where the flow of vehicles must be maintained to prevent congestion.


It is important to remember that these markings are different from other yellow signals that may indicate roadworks or emergency situations. In the case of markings formed by yellow squares, the main objective is **to prevent vehicles from stopping in a place where they could cause traffic problems**.