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？
7 K, l  q0 k9 Q5 T& o. ~谢谢！

EightBelow

U-turns
2 w/ {& B0 U0 a1 K% I- h8 E• Do not make a U-turn unless you can do it safely and without interfering
with other traffic.
• Outside urban areas U-turns are not permitted on a curve or near the
9 T" z/ x9 z/ J& x3 Wcrest of a hill where the driver of another vehicle cannot see your vehicle.
$ g7 p1 a  ^/ F5 i/ @& _U-turns are not permitted in urban areas in the following situations:
• On a roadway between intersections.
4 L" c) @9 G0 a4 R) q4 h0 n% n5 T) L• Where a sign prohibits making a U-turn.
* Y7 b$ K  D7 i7 |: ^. m0 V. n' J• At an intersection controlled by a traffic-control signal (traffic lights).
• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。