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。
; h7 A. i, \/ d. o$ O! A$ B请问u-turn到底是不是合法的？
. J: ?% }' t  Z! |7 A3 u# N谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
+ u$ T  _3 I# L8 `) F# Y/ w• Outside urban areas U-turns are not permitted on a curve or near the
% H8 T5 ?4 C; G1 o7 ?5 Bcrest of a hill where the driver of another vehicle cannot see your vehicle.
5 E3 `2 a' q; g' [& Z. bU-turns are not permitted in urban areas in the following situations:
0 Y$ }4 w1 Q- K• On a roadway between intersections.
0 f; p" X) f8 P" d. H1 ]% l• Where a sign prohibits making a U-turn.
. ?  ?' p1 ~8 Z, t* G• 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。