Which of these signs is called "End of one-way road"?

Explanation

Sign number 4; a wide white arrow pointing up on a blue field, crossed by a diagonal red bar.

In the group of blue information signs a simple rule applies: the sign itself announces the beginning of a traffic regime, and the same sign with a diagonal red bar announces the end of that regime. The "one-way road" sign is a wide arrow pointing up on a blue field; so "end of one-way road" is exactly that arrow with a red bar across it — that is, sign 4 in the picture.

This sign is not a mere formality of information; from the moment you pass it, the state of the road changes completely. Until then the whole width of the carriageway belonged to your direction of travel and you could use any lane; after it, the left half of the road belongs to oncoming traffic. That is, you must return to the right half at once and stop using the left half for overtaking or U-turns. The deadliest crashes arising from this error are head-on collisions with a vehicle the driver was not expecting.

To memorise it, hold this distinction fixed: a single arrow means one-way traffic, but two arrows in opposite directions mean reversible traffic. Sign 1 in the picture has exactly those two struck-through arrows and is the most frequent decoy in this question.

• Sign 1 has two arrows in opposite directions; that means "end of road with reversible traffic", not one-way. The only visual difference is the number of arrows, and that is what makes it tempting. • Sign 2 shows a bus and several lanes and marks the end of a road with a lane for public service vehicles, not the end of one-way traffic. • Sign 3 has no red bar at all; its arrow deviates across a broken line onto a parallel carriageway and "ends" no regime whatever. • Sign 5 has an upward arrow together with a bus and marks the beginning of a road with a lane for public service vehicles — the opposite of an "end".

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