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？
/ j6 Z+ P% A4 ~, {; @1 j谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
/ e+ ?% B5 U3 d* k6 @with other traffic.
* [7 _6 V0 ^7 X1 c" f+ y• Outside urban areas U-turns are not permitted on a curve or near the
# @) f& \6 F& U& V. x. U) Zcrest of a hill where the driver of another vehicle cannot see your vehicle.
: G3 p4 M& a% S1 YU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
9 [$ w2 N; t& [! Z6 b, R0 f8 m/ g• 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。