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。
" Q5 o3 y7 b1 d请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
! J9 n$ P  X! w0 G  D+ e' Q• Do not make a U-turn unless you can do it safely and without interfering
. n$ P/ }* Z2 v) ^" C) Twith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
. G* V! m$ r2 d* P$ `crest of a hill where the driver of another vehicle cannot see your vehicle.
1 I' l& n% y# S/ \0 u( c7 Q, HU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
/ |7 I3 m: e5 H. a0 B5 I$ c• Where a sign prohibits making a U-turn.
• 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。