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
3 h& _7 N2 x! c, B( L" p4 M8 Z• Do not make a U-turn unless you can do it safely and without interfering
% k" @8 X- e  _4 e! gwith other traffic.
+ Y3 M* H3 Q8 W- A" p' a• Outside urban areas U-turns are not permitted on a curve or near the
2 X: ]8 i1 ^; k2 ~% v1 Q" Tcrest of a hill where the driver of another vehicle cannot see your vehicle.
1 {1 H1 V% w# u9 U( C" e  j" lU-turns are not permitted in urban areas in the following situations:
6 o. L9 M! [; {2 A& Q• On a roadway between intersections.
% k' l' D  }' e• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
: u" |$ G" r+ e% z• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。