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。
, F; o: A# c3 y% g  h4 y5 n7 Z0 w; s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
with other traffic.
• 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:
/ N7 L* c+ o+ f1 W2 F: }' L8 H2 f, j• On a roadway between intersections.
7 o# e9 Y* L; q6 W8 C• Where a sign prohibits making a U-turn.
) j& k; q: Y* Q& l; ?• At an intersection controlled by a traffic-control signal (traffic lights).
, P3 b' f" p, x: ]! x& I• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。