Which two vehicles have to wait at the junctions?

In this scenario, the focus is on understanding traffic rules and the right-of-way at junctions. Typically, the vehicles that must wait at junctions are those that do not have the right-of-way due to traffic signals, signs, or other vehicles already in the intersection.

When considering why the choice of vehicles 2 and 3 is correct, it's important to analyze the context in which these vehicles are positioned relative to the rules governing right-of-way. If vehicle 2, for example, is approaching the junction on a road without a stop sign while vehicle 3 is entering from another road that requires them to yield, this would justify the situation where both these vehicles need to wait.

Moreover, understanding the layout of the junction and the rules that apply to it is crucial. If there are indications such as stop signs or traffic lights favoring vehicle 1, then vehicles 2 and 3 would indeed need to wait until they are clear to proceed, following safe driving practices and adhering to traffic regulations.

In this case, vehicles 2 and 3 must wait due to the prevailing traffic rules that prioritize the movement of other vehicles at the junction, thus ensuring safety and flow in the roadway.