In what order must the vehicles proceed?

The correct order for vehicles to proceed is 2-1-3 because it takes into account the right-of-way rules that govern traffic situations. In many cases, the guidance provided by signage, road markings, or the layout of the intersection dictates which vehicle must yield and which has the priority to move.

In typical scenarios, the first vehicle to approach an intersection usually has the right-of-way unless otherwise indicated by traffic control devices. This means vehicle 2 is first in line and is granted the right to proceed before vehicle 1. Following that, vehicle 1 may proceed after vehicle 2 as it is already positioned to enter the roadway or intersection, while vehicle 3 must wait until it is clear to follow.

Understanding the flow of traffic is crucial for safety, and following the established protocols ensures that all vehicles navigate the area efficiently without conflicts or accidents. In this case, since vehicle 2 has priority and vehicles should proceed sequentially based on their positions and rights-of-way, the correct choice aligns with these traffic rules.