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。
请问u-turn到底是不是合法的？
0 i" ?; _4 i% i4 @) M谢谢！

EightBelow

U-turns
9 I8 Y0 q8 r) y; V- p• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
• 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.
  C$ @+ h6 r- \9 h" q6 EU-turns are not permitted in urban areas in the following situations:
+ \" D5 S  r  X+ D! ~6 n8 T$ ~7 G• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
7 P' i  A, c* B' H• At an intersection controlled by a traffic-control signal (traffic lights).
6 }$ s; |2 l9 W# ?- v& X$ D! c$ R• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。