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？
0 Z. M; x& m- y/ t2 z谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
( b+ G# {( q, i0 X9 Q9 y• Outside urban areas U-turns are not permitted on a curve or near the
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:
! q3 n& b5 v( p) }* c3 q• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
% ~/ f7 w+ s: m2 a1 p& S8 B# u• At an intersection controlled by a traffic-control signal (traffic lights).
" e1 ]- M( W0 n' {2 b• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。