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。
* N+ i; n& E9 x1 Q; u请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
  ~+ `# r( Z$ l" u0 A! K( K/ m3 s• Do not make a U-turn unless you can do it safely and without interfering
( B2 Q* ^/ Y5 y/ F0 Qwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
3 ^- h- i$ i: x+ Pcrest 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.
0 ^: K' q1 S' o' Y  ~) |/ M• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
2 U( I/ M" }& M8 k• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。