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？
+ t, i  V8 J% o" L6 g$ h  ?谢谢！

EightBelow

U-turns
% }  A( l9 W& M8 t3 ?" l• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
* Y4 T. i$ v$ w4 A• 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.
& ^) c; s& T! J" ~# RU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
6 v- N4 w7 M) k. T7 m• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
- H. N6 F4 v6 {( X& s) @, a- d, y• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。