Does any one have any details on the law. I know it has to be a 1in by 8in line minimum at a height of 3-5ft but is that horizontal or vertical? How far apart does the lines need to be, 50 yds, 100yds, 500yds? Is there a particular shade of purple or will any shade do? I have tried to find this but can't seem to find much. Do signs needs to be so far apart and then purple in between or signs only at entry/exit points? Thanks