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。
! A% o! Z; H- ~2 T请问u-turn到底是不是合法的？
1 C+ X$ ~2 L( m  i谢谢！

EightBelow

U-turns
; y- W+ f; `$ I3 O4 P• Do not make a U-turn unless you can do it safely and without interfering
1 R$ s9 @! d/ s% O* r" y: I, `with other traffic.
- J" |9 Y; p* p) \& {; U0 j• 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.
3 T, v  A. F* U2 [6 _3 Y# v8 ~U-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
) X3 _( D0 H6 Z8 x/ e• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。