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。
# D8 x6 t: K6 A% u5 G: b请问u-turn到底是不是合法的？
' x- W$ P1 L- B谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
; h4 A0 D7 X$ D4 A4 J+ ~with other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
( Q7 R0 g: B# S: `0 h4 Qcrest 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:
* b) |- r4 z6 f• On a roadway between intersections.
3 D* G  x! w0 Z# n) H- r( \- s• Where a sign prohibits making a U-turn.
5 g8 ]/ T, T- R0 s  V0 h$ d$ H* n• At an intersection controlled by a traffic-control signal (traffic lights).
. r7 G4 a% k" d% s  b2 ^5 \• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。