Investigating a couple of highway boards for sale on a 65 MPH highway. Looking for ideas on how far away in feet you should be able to see a 14x48 board at 100 feet high and another at 60 feet high to top of signs based on 65MPH so you don’t get a blur as you drive past. Is there any standard that on a highway a good board can be seen for xxx feet as a vehicle approaches it before crossing past the board? I would think advertisers are looking at some minimum # of feet even before the sign can be read with the eye? I know that the longer distance the better but what is considered an average # of feet that would still represent a good location? The flip side, what amount of distance viewing in feet would be to short at 65 MPH in that advertisers would stay away from?