When do you have to check your mirrors?

A)Only when you are about to perform a manoeuvre.
B)Only when necessary.
C)Regularly, even when you are not going to perform any manoeuvre.Correct
We must check our mirrors frequently. What happens around us changes constantly and very quickly, so it is important to be prepared for any unexpected situation that may arise.
Mirrors should be checked continuously even when not performing any manoeuvre:
- On urban roads and roads with heavy traffic: every 5–10 seconds.
- On roads with no traffic and dual carriageways/motorways: every 10–15 seconds.