i may be ignorant on this issue, but need to know.

It used to be if you were not driving for 3 mo or more, they would make you go back and have refresher courses before a company would hire you.

Also I think the no U-turns is because of the possibility of cars running under you, esp if it is dark out and they don't see you. There have been quite a few deaths in the past few years because of this.