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。
; q6 D) @5 F9 @( z请问u-turn到底是不是合法的？
: J/ t9 c: h! j0 s3 t! k谢谢！

EightBelow

U-turns
/ R; G4 ]4 I; i* k5 O* V3 E• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
* [, R5 _- E+ W# u  V' Q• Outside urban areas U-turns are not permitted on a curve or near the
4 c# \! S3 ~+ {4 _2 {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:
3 N/ K5 ]$ w3 h0 ^1 a- |• On a roadway between intersections.
, |1 m8 l6 _* @- A% z7 I4 h$ i• Where a sign prohibits making a U-turn.
9 K$ z2 E; e7 {• At an intersection controlled by a traffic-control signal (traffic lights).
* ?1 d& {  s1 H- I6 Y" A• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。