The second to drive through the intersection:.

Explanation

The green car.

At this junction no priority sign and no traffic light is posted; so the roads are of equal status and the order of passage is set solely by the right-hand rule: give way to the vehicle coming from your right.

One arm of the junction is empty and that is what unties the knot. There is no vehicle on the red car's right, so red passes first. The green car has red on its right and must wait; it is the second vehicle. The blue lorry in turn has the green car on its right and comes third. The order is complete: red, green, blue lorry.

The reliable way to solve this kind of question is to look first for the vehicle whose right is empty; it is the loose end of the thread. Then remove it and ask the same question again until the order is complete. The safety reason is simple too: at an uncontrolled junction most crashes are side impacts, that is, where the blow lands directly on the occupant's door and the car's structure offers the least protection. The common exam trap is the size of the vehicles; the candidate unconsciously puts the blue lorry first, whereas the dimensions and weight of a vehicle play no part in priority.

• The red car is correctly identified as having priority, but it is the first vehicle, not the second; its right is empty and nothing holds up its movement. • The blue lorry is tempting because of its size, but the green car is on its right and it must wait; the lorry's place is third.

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