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。
+ _& M/ h2 r: n$ @* }请问u-turn到底是不是合法的？
$ N8 f# O$ M5 A& R0 |谢谢！

EightBelow

U-turns
, ]% f7 x' e7 [- |• Do not make a U-turn unless you can do it safely and without interfering
+ u, |: P. ]: ~% F) R" b: E! ewith other traffic.
• 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:
• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
• 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。