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。
9 O$ `- p6 r% J0 w+ Z+ a8 e1 S# {; z) z请问u-turn到底是不是合法的？
, O6 z8 r: g0 G  w( q6 n% A/ r& S谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
7 A1 L% s' O) `: s( e4 p7 y1 W6 S" Awith other traffic.
8 Z7 A6 r+ l0 }( U% }8 T" w• Outside urban areas U-turns are not permitted on a curve or near the
6 i* o5 t( K: F; ?crest of a hill where the driver of another vehicle cannot see your vehicle.
9 h! F- X& Z8 RU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
; T% E; S1 j7 v8 S9 t1 ^• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
7 I8 V' H' k: h9 {9 {1 M• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。