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。
+ B  I" o8 x) L6 i( ^9 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
, S2 O" L- e! K2 ^# c5 dwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
$ U( S4 u4 @2 J, P" h& wcrest of a hill where the driver of another vehicle cannot see your vehicle.
/ d0 G' Y. n) o9 ^3 D* ?U-turns are not permitted in urban areas in the following situations:
# e' a! m2 k* X/ r! G• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
7 D, k5 h7 D5 W0 V! H6 `* c4 i' k0 n• 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。