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？
; B- I$ w- ^& W谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
; H* K) w7 i/ jwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
! G: n$ x6 x+ S; ~) }5 q; z+ Zcrest 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:
; L$ {/ B/ u! Z+ V) _) I& b• On a roadway between intersections.
( x" m; c6 K& j' m/ L• Where a sign prohibits making a U-turn.
# z: _8 k/ h, V# k. C6 k/ N• At an intersection controlled by a traffic-control signal (traffic lights).
• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。