I'm very astonished to read that a bill board is not at all a small wooden board where the waiters of a pub with local flavor may write down the number of drinks the guest consumes and finally add the prices to get the total bill.
It comes as no surprise to me that you be astonished, St. Johann. I guess you spend a lot of time in pubs. But the word bill has so many different meanings that it plays a trick to more than one. [CW]
Dear St. Johann, since you know, that a bill-board is not the place where the bill will be produced, what do you want to know then?
A billboard is that huge board you may find roadside or at a house wall in town, with advertisement of products like Coca-Cola, Volkswagen or McDonalds.