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。
" w3 o# _9 g/ Y9 S1 M+ |% o请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
' v! ?; h( n# B" `* t% c) G4 \9 Q• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
0 z, @& D4 z$ M) G4 D• Outside urban areas U-turns are not permitted on a curve or near the
4 Z3 G* E/ e' h0 {0 Hcrest of a hill where the driver of another vehicle cannot see your vehicle.
4 l4 }- t7 P8 ~- {5 l9 ]3 vU-turns are not permitted in urban areas in the following situations:
% b8 L! \9 P1 x/ {/ H• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
/ p5 _( }' T; A$ B. a9 `$ x3 b• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。