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。
8 K4 t& b( J. X4 ^请问u-turn到底是不是合法的？
谢谢！

EightBelow

U-turns
' W* W8 G& m( B! Z0 M( K• Do not make a U-turn unless you can do it safely and without interfering
' L. d6 h% N/ ]4 U9 w9 L. cwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
( }2 o; ?. c( e, ucrest of a hill where the driver of another vehicle cannot see your vehicle.
. Y$ U+ V' o, |& x, U+ RU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
2 i- \1 u2 b1 ~/ }' K( E! v+ k• 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。