One of the show me tell me questions the DSA examiner might ask you before the start of the practical car driving test is to demonstrate how you would check that the car horn is working.
Tip: Did you know that your driving test will be cancelled if the vehicle's horn was not working, and you will lose your very costly test booking fee!
So when on the test would it be appropriate to use the car horn? The attached video clip taken from an actual driving lesson shows an example of such a situation.
It is more appropriate to have used the horn to stop the car from entering the main road, than to stop on a major highway un-necessarily and affecting other road users or try to get past the vehicle by driving on the wrong side of the road.
Other situations where you might want to use the horn during the dsa practical car test include if you are behind a car at traffic lights and the lights change to green but the car driver is not paying attention, then a short beep is acceptable to alert them.
You could also use the horn to stop a pedestrian from walking into the road if they are not paying attention (on a mobile phone or listening to ipod/mp3 player).
Driving test age is still 17.
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