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The Permit Test
No U-Turn (MUTCD R3-4 sign)

No U-Turn

regulatory sign · rectangle v · white

U-turns are prohibited at this location.

Visual breakdown
White square with a black U-shaped arrow inside a red circle with a slash through it.
Shape recognition
Square regulatory sign; the curved arrow shows the prohibited maneuver.
Color recognition
Red circle-and-slash always means 'this specific action is forbidden.'
Memory trick
Red slash through the U-arrow: the U is locked out. Slash = 'don't.'
Real-world example
Common at divided-highway crossovers and busy intersections where a U-turn would block oncoming traffic.
Common mistakes
Assuming a U-turn is fine because no oncoming traffic is visible — the prohibition applies regardless of traffic.
Quick recall method
Slashed U-arrow = no turning back here.