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？
; V2 ^1 Q1 v/ M谢谢！

EightBelow

U-turns
5 P: R; F: w0 }- F/ L  }8 h, W, @• Do not make a U-turn unless you can do it safely and without interfering
/ A8 A- K8 G1 pwith 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.
+ M5 m- S2 l, C0 iU-turns are not permitted in urban areas in the following situations:
/ [# R3 q& |$ v( P6 O• On a roadway between intersections.
• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
# E. A  P0 I; C9 ?4 U* `+ k6 v• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。