Your vehicle is stationary in traffic. When are you allowed to use the horn?
DVSA explanation
If your vehicle is stationary, only sound the horn if you think there's a risk of danger. Do not use it to attract attention. This causes unnecessary noise and could be misleading to other road users.
Want more free practice?
Ready to test yourself on the latest DVSA revision questions?
More free ways to get ready for your DVSA ADI Part 1 theory test.