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。
请问u-turn到底是不是合法的？
) z( G# C& J4 O# T2 D% @谢谢！

EightBelow

U-turns
! ~+ O" z4 e: q! Q• Do not make a U-turn unless you can do it safely and without interfering
' N2 O! X6 p. d7 V6 V0 b, Fwith other traffic.
% ~5 m/ \1 Z. i* G* A7 i• Outside urban areas U-turns are not permitted on a curve or near the
2 }' u9 ?7 j# t8 Y/ c# n1 ycrest of a hill where the driver of another vehicle cannot see your vehicle.
6 }1 O( F0 j9 o& E5 n$ ], qU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
; t+ V) }# n8 A* J- `) P, N' u  y• At an intersection controlled by a traffic-control signal (traffic lights).
/ c# o! n! ?2 @% Y/ r- c• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。