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。
! v5 U7 B% R+ \  K' Z2 d' T请问u-turn到底是不是合法的？
3 W, b0 Z! H/ u7 V, I- x4 u8 u谢谢！

EightBelow

U-turns
% i/ R" y- N$ d1 T• Do not make a U-turn unless you can do it safely and without interfering
! v9 n+ v  ~4 P8 i, l8 hwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
# S. J) [9 Q* m/ a- Bcrest of a hill where the driver of another vehicle cannot see your vehicle.
2 p( R! a) E' @" ZU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
) P5 j2 s4 |7 `, C8 {/ |• Where a sign prohibits making a U-turn.
* E" k, p+ J9 {# o• 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。