Movement Prohibition (No U-Turn) Sign (R3-4)
The movement prohibition (no u-turn) sign is a square and its colour is white. It is a regulatory sign: it states a traffic law you must obey. Ignoring it is a citation, not a judgement call.
At a glance
| Shape | square |
|---|---|
| Color | white |
| Category | Regulatory signs |
| MUTCD code | R3-4 |
How the test asks about it
- 1.
In a residential district with no sign like this posted, when may you make a U-turn?
Not quiteCorrect answer: B — When no vehicle is approaching within 200 feet
In a California residential district you may make a U-turn only when no vehicle is approaching within 200 feet. U-turns are never allowed on a divided highway where you would have to cross a barrier, or where a sign prohibits them.
Signalling does not by itself make a U-turn legal — the clear-distance requirement still applies.
- 2.
Which manoeuvre does this sign forbid?
Not quiteCorrect answer: B — Turning around to travel back the way you came
The symbol is a U-shaped arrow crossed out, so the sign prohibits the 180-degree turn and nothing else. A left turn is a different movement with its own sign; unless a NO LEFT TURN sign is posted as well, the left turn may still be allowed.
Treating the no U-turn sign as a no left turn sign. They are separate signs prohibiting separate movements.
Related signs
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