Which vehicle should give way?

Explanation

The red car.

The round blue sign with circular arrows, posted beside the red car right at the entry, is the "roundabout" sign. It means the circular carriageway of the roundabout counts as the priority road in relation to this entry; so the red car must give priority to the blue car, which is already moving inside the roundabout.

In practice this means: approach the entry with your right indicator on, reduce speed to the point where you can stop completely, look left, and enter only when no vehicle on the circular carriageway will reach you. Stop completely behind the entry if necessary. Entering a roundabout carelessly is one of the most frequent urban collisions and is almost always recorded against the entering car.

The legislator's reason is exactly this: a roundabout works only if its circle is continuously emptied. If the entries had priority, every entry would cut the circulating flow, a queue would form inside the roundabout itself, and the whole knot would lock. The exam trap is clear too: forget "the red car comes from the right"; the right-hand rule is not applied at the entry to a roundabout.

• The blue car is already on the circular carriageway of the roundabout and has priority; someone moving inside a roundabout does not stop for an entering vehicle.

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