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？
0 H3 p7 f7 {3 h" h谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
3 V2 q, \5 f9 _6 Pwith other traffic.
( ?# K/ r2 ~/ c3 o# v• 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.
4 w  _- T: q9 J  h  PU-turns are not permitted in urban areas in the following situations:
% z: i2 X0 G# y, g" u4 k  k• On a roadway between intersections.
6 y  K/ \9 d5 v+ O) j; r8 `+ t• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
% R5 G* n. C3 ]7 L+ c• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。