The driver of a green car:

Explanation

Is entitled to priority.

No priority sign is posted in the picture and both roads are of equal status; at such a junction the only governing rule is the "right-hand rule": every driver must give way to the vehicle coming from his right. The red bus comes from the road on the green car's left, and conversely the green car is on the bus's right. So the green car — whose right indicator is also on and which is continuing its path from the adjacent lane — has priority, and the bus must wait.

The safety reason for the right-hand rule is that it provides one simple, undisputed reference for all unsigned junctions. In a few seconds a driver cannot judge the width of a road or its importance, but he can always turn his head to the right. That single fixed glance shuts off side impacts in the middle of the junction.

The trap in this question is the "bus". A public-transport vehicle has no general priority at a junction. The only recognised exception is a bus pulling out from a marked stop inside a built-up area with its indicator on; then it must be given way. Here there is neither a stop nor a marking; so the bus is subject to the right-hand rule exactly like any other car.

• "Must give way" would be right if the bus came from the green car's right, or if a sign made the bus's road the priority road; neither exists in the picture.

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