What is a requirement for the vehicle's horn during the driving test?

The requirement that the vehicle's horn must be operational is critical for the driving test, as the horn is an essential safety feature used to alert other drivers and pedestrians of your presence or to signal warnings. An operational horn ensures that the driver can communicate effectively in various traffic situations, enhancing safety on the road.

For the driving test, the examiner will check that the horn functions properly, as this indicates that the vehicle is roadworthy and that the driver understands the responsibilities of operating a vehicle equipped with this safety tool. Having a properly functioning horn is part of ensuring the vehicle meets the standards for safe driving, which is why this choice stands out as the correct requirement.