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。
% Q2 s# m8 |2 p1 M" o请问u-turn到底是不是合法的？
7 g/ N8 `$ ^% y' ^' c; \谢谢！

EightBelow

U-turns
. K) o: c: Y; M( K( \, d8 _. I3 p• Do not make a U-turn unless you can do it safely and without interfering
  v+ @4 _2 a5 y5 m" C# v) p7 mwith other traffic.
0 _$ q, }# c3 w6 `' [( \• 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:
• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
* O) b6 ~2 d7 l. ~• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。