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。
: h- o5 _% U5 Z& i/ V4 Q, _请问u-turn到底是不是合法的？
2 O6 a4 q3 m( u6 G, ]谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
/ p" ~6 ?% ^) _% h6 Q. t4 Twith other traffic.
9 f5 n% l2 a, p9 E$ o# `# J7 ]• 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:
7 r+ L; G6 Y$ @% |, d7 }# ?  s• On a roadway between intersections.
, ]( l" G+ v$ x+ t6 v& `1 T2 k* ]• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
0 S( e& \% n: A• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。