The last one to drive through the intersection:

Explanation

The blue car.

At this junction there is no traffic light, no yellow priority diamond and no give-way triangle; the roads are of equal status. None of the three vehicles is signalling, meaning all are going straight. In such a situation your only tool is the "priority to the right" rule.

To put the order together you must start where nobody is on someone's right. The green lorry on the right of the frame comes from a road whose right-hand side is empty, so it is the first to pass. The red car moving up from the bottom of the frame has the lorry on its right and must wait; it is second. The blue car on the left has the red car on its right, so it moves after the red one and is last.

The point to keep in mind is this: at an equal-status junction never go straight to "who goes first". First see whose right-hand side is empty; the chain opens from there and arranges the rest one behind the other. The safety reason for the rule itself is simple too: a driver has a better field of view and more control on his right, and impacts from the driver's side — the most dangerous kind of side collision — occur less often with this ordering.

• The green lorry is precisely the one whose right is empty; it is the first to pass, not the last. • The red car gives way only to the lorry and goes ahead of the blue car itself, so it stands in the middle of the order.

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