What is one of your pet peeves as a motorist?

People who make an extra effort to get in front of you then slow to a snail's pace make me want to scream!

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Beeping horns. Never, in the UK, has beeping been as bad as it is these days. It's that bad that when I hear one, I check my mirrors to see if I did something mystically wrong. At one time it was an offence to beep your horn in the UK unless it was for safety reasons.