Which answer correctly states the order of passage?

Explanation

First the motorcycle, then the bus and last the lorry.

At this junction there is no traffic light, no priority sign and no difference between the roads; so the junction is of equal status and the only criterion is the rule "priority belongs to whoever comes from your right". All three vehicles are going straight, so only their direction of entry matters.

Now unfold the scene with that rule: the motorcycle's right — it enters from the bottom of the picture — is empty, so nobody precedes it and it passes first. The bus comes from the left and the motorcycle is precisely on its right, so it must give way to the motorcycle and comes second. The lorry comes from the top and the bus is on its right, so it is last. The chain is clear: motorcycle, bus, lorry.

The safety reason for this rule is its simplicity and certainty: each driver checks only one direction and need not guess at anyone else's intentions. A decision at a junction must be possible in under two seconds, and any more complicated rule ends in practice in hesitation and a side collision.

Exam trap: the bus's size and public character create no priority. The size of a vehicle, its number of passengers or its flashing lights have no effect at an equal-status junction.

• This puts the bus ahead of the motorcycle, whereas the motorcycle is on the bus's right; the option is built on the mistaken idea that the larger or public vehicle goes first. • This both puts the motorcycle last and disturbs the order of bus and lorry; the lorry gives way to the bus on its right, so it cannot go before it.

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