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。
' E; C& Y/ z. [: H( i4 ~请问u-turn到底是不是合法的？
% ]" p! t0 s' V谢谢！

EightBelow

U-turns
3 j; ?& A, Y" b7 r6 X* f) t• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
! Q. ^, A7 `* q• Outside urban areas U-turns are not permitted on a curve or near the
# \* F4 p0 r! d. ]+ Wcrest of a hill where the driver of another vehicle cannot see your vehicle.
- g) P+ X! J+ Q* `% h, R9 YU-turns are not permitted in urban areas in the following situations:
2 U5 A' C6 A& ]  h• On a roadway between intersections.
; z6 d! Z' k& f/ B• Where a sign prohibits making a U-turn.
' f" A: _- |! T, S; H• At an intersection controlled by a traffic-control signal (traffic lights).
7 u% b* `6 V5 \  i/ A3 c; C• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。