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？
2 B) z3 C. m9 i谢谢！

EightBelow

U-turns
• Do not make a U-turn unless you can do it safely and without interfering
- X! @7 u+ t' b0 x( ^with other traffic.
! p1 s6 l0 |# |; B• Outside urban areas U-turns are not permitted on a curve or near the
# C. E# @8 ^6 a* Z& p3 D# Jcrest 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:
• On a roadway between intersections.
3 w8 B  `5 S4 Y+ f• Where a sign prohibits making a U-turn.
• At an intersection controlled by a traffic-control signal (traffic lights).
# q, F' _9 R, R( D) Z8 Y( }, ~% f' W• At an alley intersection.

无语

有红绿灯的地方U-Turn是违规的。