As a general rule, without express authorisation for a U-turn, in which of these places is reversing the direction of travel prohibited?

Correct answer

On stretches where overtaking is prohibited, without express authorisation for a U-turn.

On stretches where overtaking is prohibited, unless a U-turn is expressly authorised, under Article 79. It is also prohibited where the manoeuvre cannot be confirmed safe, at level crossings, tunnels, underpasses and sections covered by the tunnel sign, and on motorways and dual carriageways except designated places. Reversing direction of travel means turning to travel the opposite way, not merely turning left or right. A single-lane roundabout does not itself prohibit taking the exit that leads back; respect signs and navigate it correctly.