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。
8 a: n/ m! C; ~; B$ l+ {  k请问u-turn到底是不是合法的？
! a) l- {5 S5 }- ?" j. P谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
& i% b3 V3 m; b3 E% |6 w& s6 |6 ?• 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.
% ?- C/ ~+ S$ Y' t& `9 o. h' tU-turns are not permitted in urban areas in the following situations:
# @( f0 A: T7 x: x+ |; \• On a roadway between intersections.
! B9 G4 Q- E' |6 C, H! B• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
& ^+ \' C7 E9 o! {% n8 A! J• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。