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。
; @0 ^" t2 l' G" a5 I请问u-turn到底是不是合法的？
" f& B) A& T! Z  G谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
( W* D) t) Z2 y# B/ L, Iwith other traffic.
% z$ e- d0 U3 t9 G, ?  c• 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:
• On a roadway between intersections.
: f8 y# H' U$ `3 [• Where a sign prohibits making a U-turn.
3 o0 E( K1 E$ f6 Q• At an intersection controlled by a traffic-control signal (traffic lights).
( K- \3 i) J! ?3 S9 Q  m• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。