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？
谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
: S( K# s. Z* }6 X! L4 a, m+ R" P0 Awith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
4 P6 b1 d0 z( L( W" ?crest 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:
8 z- \$ M4 h' m7 V! W• On a roadway between intersections.
5 r! I# Q: H1 n: f- w: @6 J  U8 q+ b0 P• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
0 X, [/ \; X  Z; f• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。