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) x& R5 c2 E# q5 T请问u-turn到底是不是合法的？
8 u7 Q) B0 u0 B1 v) `. d$ Y谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
' B- z! X: B3 k+ `. B• Outside urban areas U-turns are not permitted on a curve or near the
% i/ d2 l* O9 s' kcrest 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:
( {7 M9 k. M) B. k$ g0 p% r+ `• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
1 y+ K7 g  A* M4 @( e• At an intersection controlled by a traffic-control signal (traffic lights).
' Y) q. H2 h7 e- U• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。