At this intersection, which car must go first?

Correct answer

The yellow one.

The Traffic Regulations state that when driving and approaching an intersection without signs indicating priority, we must give way to all vehicles approaching from our right, including bicycles. Following this rule, the blue vehicle gives way to the red vehicle, which gives way to the yellow one; therefore, the yellow vehicle is the first to pass, as it has no vehicle on its right to which it must give way.