Can you make a u-turn if a no left turn sign is posted?

Answer 1

If it's a one way street, whether or not it has traffic lights, the answer is going to be no. At some point, whether before or after the U-turn, you're traveling in the wrong direction, hence, you're in violation of the law.

Answer 2

You can make a u-turn if there is no sign prohibiting it.

The R4-8 sign (Keep Left) does not regulate turns, but rather the movement of traffic around something in the center of the road.

Answer 3

NO. You may not. You actually must turn LEFT - in opposition to oncoming traffic - in order to make a U-Turn. There is a reason that restriction is posted, and it is usually safety-related.