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。
3 f; J3 s6 i0 t- l( g2 ?请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
9 q- p1 ?' P+ n' p  C6 a( D3 N• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
% M+ X4 V: i) T! i$ O• Outside urban areas U-turns are not permitted on a curve or near the
+ M. l$ N  E; l6 wcrest 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:
• On a roadway between intersections.
* }$ g' R( ]! s3 k8 i2 Y& Z/ U• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
" [8 s/ [" z  u* w" W! X/ p3 x1 k• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。