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。
7 ?, h/ a. x/ u9 A请问u-turn到底是不是合法的？
! o% a* U6 U* Y- H& T1 B谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
$ y  x  A, h9 Pwith other traffic.
5 v% p. \8 j4 c+ ]' E& n• 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.
" ]$ W3 ~# }2 j+ l6 @6 g6 u$ w/ E• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
2 e* ^4 B# A' h• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。