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 [" O2 ^% r: ?; n请问u-turn到底是不是合法的？
1 F. n: z2 b6 l谢谢！

EightBelow

U-turns
% ~; m7 C3 W# v0 n* b* @; Y% t: h• Do not make a U-turn unless you can do it safely and without interfering
* ?' T1 [0 r( {$ n8 r& Z$ iwith other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
$ o- c! M9 b7 Wcrest 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:
! B4 |% N3 a/ }& \: v9 T7 d• On a roadway between intersections.
6 `; q0 |* t7 V+ _8 X• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
- W1 R' ]' X3 x0 {9 F4 k• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。