Road and traffic signs
What does this blue circular sign tell you to do?
- A road is ahead — slow down
- You must go straight ahead onlyCorrect
- This is a one-way street
- No U-turn
Why?
Blue circular signs give a positive instruction you must follow. The white upward arrow means 'ahead only', so you must continue straight on and not turn off. Rule 109 of The Highway Code says you must obey signs that give orders.
Highway Code rules 109, Traffic signs