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。
' x& L; e5 b. b* B请问u-turn到底是不是合法的？
/ @5 {3 I6 |' p7 G谢谢！

EightBelow

U-turns
+ G" F3 Q' L  D+ l  p• Do not make a U-turn unless you can do it safely and without interfering
& e! Z: u0 j! r) p4 a# mwith other traffic.
% |+ @+ d4 }, l0 }• Outside urban areas U-turns are not permitted on a curve or near the
  ]: y! B7 o3 gcrest 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。