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。
/ `- m# [9 j6 i6 _- D' g请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
- M' N% X4 Y. t. v) x- `) T1 ?with other traffic.
1 V: F% i/ v# h3 k• Outside urban areas U-turns are not permitted on a curve or near the
0 Z  V9 f5 d$ T) Vcrest of a hill where the driver of another vehicle cannot see your vehicle.
  j! i/ D+ M9 _6 Z; ]0 K: sU-turns are not permitted in urban areas in the following situations:
. q4 Y# f) y* l, n+ G( [1 T• On a roadway between intersections.
& c& C+ y) T5 M) y$ M4 `• 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。