Which vehicle is required to signal before making a maneuver?

In this scenario, the correct answer indicates that both Vehicle 1 and Vehicle 3 are required to signal before making a maneuver. Signaling is an essential aspect of driving as it communicates the driver's intentions to other road users, helping to ensure safety on the road.

For Vehicle 1 and Vehicle 3, signaling is not only a best practice but is often mandated by traffic laws. These vehicles could be in a scenario where they are changing lanes, turning, or merging, and signaling lets surrounding drivers know what to expect, allowing them to react accordingly.

The requirement to signal applies to all vehicles as a general rule, but in this particular question, focusing on Vehicles 1 and 3 highlights the importance of understanding that specific situations or laws may necessitate signaling more critically based on their movements. This reinforces a driver's responsibility to communicate their actions clearly to maintain a safe driving environment.