Which two vehicles have to wait at the junction?

In traffic situations, the rules governing right-of-way are crucial for determining which vehicles must yield or proceed. The correct answer indicates that vehicles 2 and 3 need to wait at the junction. This could be due to various factors, such as their positions relative to road signs, traffic signals, or other vehicles already occupying the intersection.

One common scenario where certain vehicles must yield includes circumstances where one vehicle is approaching from a main road while others are coming from a secondary road. For instance, if vehicle 1 is on a primary road with the right-of-way, vehicles 2 and 3, potentially entering from the right or merging from a less prioritized road, would be required to wait and allow the vehicle on the main thoroughfare to pass.

Thus, the determination of which vehicles need to yield is based on observing traffic control devices, understanding the right-of-way rules, and recognizing the flow of traffic in the given scenario. The other options would imply that different combinations of vehicles are yielding, which would only be true if the traffic conditions or rules suggested those scenarios, but in this case, vehicles 2 and 3 are the ones required to wait.