Which vehicle is entitled to priority traffic?

Explanation

The blue car, because it is already travelling on the circular carriageway of the roundabout.

The round blue sign with three circular arrows, posted beside the red car, is the "roundabout" sign. It means the circular carriageway of the roundabout is the priority road in relation to all the entries; so any driver wishing to enter the roundabout must give priority to vehicles that are circulating on it at that moment. In the picture, the blue car is travelling on the circular carriageway beside the central island and the red car is behind the entry line with its indicator on.

The safety logic of this rule is simple: if the entries had priority, the circulating flow of the roundabout would be constantly interrupted and a queue would form inside the circle itself; that is, cars would stand still in the middle of the roundabout and all the exits would be blocked. By giving priority to the inside of the roundabout, the circle always empties and no traffic knot forms.

Worth memorising: at the entry to a roundabout, the right-hand rule is set aside. The fact that the red car enters from the blue car's right gives it no advantage whatever. When approaching a roundabout, reduce speed to the point where you can stop completely, look left, and enter only when you have a safe gap from the circulating cars.

• "It enters from the right" is precisely the trap of the question; at the entry to a roundabout the right-hand rule does not apply, and the red car, as the entering vehicle, must give way.

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