有关u-turn

小胡同

最近查google map for directions, 经常会看到需要u-turn。印象之中好像在主路上不可以，不管是否有不可u-turn的牌子。平常也看到有人在红绿灯处做u-turn。
请问u-turn到底是不是合法的？
: M- x6 t1 y9 ?. D: _谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
& c- C7 }$ \4 b! ]4 z% kwith other traffic.
* y" A! B- S, g8 b+ v0 `0 u• Outside urban areas U-turns are not permitted on a curve or near the
crest of a hill where the driver of another vehicle cannot see your vehicle.
U-turns are not permitted in urban areas in the following situations:
: X: G/ F" Z: E% F* J9 ^• On a roadway between intersections.
3 J- b# X+ W& K! l9 h( ~• Where a sign prohibits making a U-turn.
& C$ P- w' c: _0 k• At an intersection controlled by a traffic-control signal (traffic lights).
• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。