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。
) X0 o7 n: A- X) r请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
: g, t/ ?7 ^0 ]- `( D& Y2 c• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
; q% c0 M* C# x( c5 M+ E9 D1 z• Outside urban areas U-turns are not permitted on a curve or near the
: Q/ e! t- j1 r# A, l; B' Icrest 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:
  O2 u) _$ z$ l" _3 h• On a roadway between intersections.
* n( v& i5 t; @/ y• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
( X- b% s8 G1 }0 g4 K• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。