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？
5 ]9 ~2 i& m# q6 z2 M* I- e6 ~( Y谢谢！

EightBelow

U-turns
" g) v- W$ m7 A, @0 S. o• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
9 A1 v2 u$ V1 K+ Z7 {+ ~: Y• Outside urban areas U-turns are not permitted on a curve or near the
1 \, \! d/ {4 Pcrest of a hill where the driver of another vehicle cannot see your vehicle.
1 t& ^- R' E- C$ b! c. \' bU-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
& [; a- W+ r4 K/ z; b7 e! O• Where a sign prohibits making a U-turn.
) h0 s& q4 V( W! [8 _( H• At an intersection controlled by a traffic-control signal (traffic lights).
/ W, J2 J, Y; M! M- N( @, C• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。