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。
: v6 i& S' T3 v& A: ]4 e; T请问u-turn到底是不是合法的？
- e% j- U, H* C/ F* @谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
1 g9 t) Q7 D% F' o6 |# hcrest of a hill where the driver of another vehicle cannot see your vehicle.
' x$ j# Z% v0 v; |/ {) y, OU-turns are not permitted in urban areas in the following situations:
6 S. O7 l, x& p8 |• On a roadway between intersections.
' d; r9 ?5 i" O3 {% n5 x* W• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
) f  L1 D# I! x2 d& {2 }& s* ~• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。