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。
% Y- a. K' V. ]& X. w请问u-turn到底是不是合法的？
7 c7 k$ u) N- z4 d/ G$ o" O6 G$ w谢谢！

EightBelow

U-turns
1 {& F# ~% J  L5 i; T; h" p• Do not make a U-turn unless you can do it safely and without interfering
0 Z0 R( |7 h! Z8 }with other traffic.
+ z. i( l+ f" C, g# h0 T  n/ U• 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.
- l) V* S3 T" ZU-turns are not permitted in urban areas in the following situations:
0 }: l" Z" H) c% c7 G% q5 |• On a roadway between intersections.
9 T' ]1 x& H- \6 w# k/ u2 s7 K2 M• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。