Are you attempting to spell ALLOWED? Answers does have a spell check use it
It's That Guy
It's probably different in different places. Here in California where I live, you can do U-turns at any intersection unless it's posted 'No U-Turn'. And you can do them in the middle of the block in residential streets. Otherwise you have to pull off the road, into a driveway or something.
In practical terms, though, you can do a u-turn on a street if there isn't a lot of traffic, and if there's room.