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。
9 y, x. g* U2 A7 D& d请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
2 v5 {3 E& w% d$ F! V• Do not make a U-turn unless you can do it safely and without interfering
) a2 @- O+ q6 ?  o" q+ a) gwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
! p6 ]1 d7 R; y! m. ?# ?0 Dcrest 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:
• On a roadway between intersections.
2 X9 p! Q8 H0 x* n, E& T• Where a sign prohibits making a U-turn.
1 l. l5 X& C& v( |! w, j3 G: _• At an intersection controlled by a traffic-control signal (traffic lights).
5 E( \# s, n  F• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。