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？
8 }, y9 ]7 }/ l- o, K谢谢！

EightBelow

U-turns
( b; C  v0 N6 x9 ~% W• Do not make a U-turn unless you can do it safely and without interfering
/ a7 p( U% b$ o3 Xwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
$ d- R- m9 o/ A6 C9 icrest 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:
- W1 }* X( T# l1 }8 g! m# K• On a roadway between intersections.
3 p! h4 n8 e& h) i• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
% D9 i9 D; o! j8 [9 m, a• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。