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。
! U1 g& y! n- A/ p2 X( s, H0 I请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
• 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.
& P% ^/ \4 n4 q' k; C  ]1 HU-turns are not permitted in urban areas in the following situations:
) h6 z) Q9 z+ {1 ]; g+ P8 H• On a roadway between intersections.
6 `0 Y) V  T- b/ X# I• Where a sign prohibits making a U-turn.
. t* m7 b, C2 T. R6 v• At an intersection controlled by a traffic-control signal (traffic lights).
5 p* B9 Q' e) X" d( |) q) I• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。