Which vehicles can proceed without stopping at the intersection?

The correct choice indicates that vehicles 1, 2, and 3 can all proceed through the intersection without stopping. This scenario typically arises when all vehicles are facing a green traffic signal or when they yield to other rules that permit them to continue moving, such as the right of way provided by a clear intersection.

When multiple vehicles approach an intersection from different directions but are given the opportunity to proceed safely without coming to a stop—either due to signals, signage, or the absence of opposing traffic—it's essential that they are aware of each other and their respective right of way.

In many driving regulations, when traffic signals or road markings allow multiple vehicles to proceed simultaneously, it is crucial that all drivers are alert to their surroundings to avoid collisions while advancing. This highlights the importance of understanding traffic control devices and the responsibilities of all drivers at intersections to ensure safe passage.