Just to be clear, the advertisements that I'm referencing are ones like this (https://www.alamy.com/stock-photo-signs-at-roadside-advertis...), where the goods being sold are sold on the property the sign is on, ie, they're basically shop signs. They are usually pretty small too, with larger ones needing the approval of the local authority. There does seem to be pretty good enforcement on this too. I'm definitely against advertisement billboards: those big slabs that are just there to distract you with any arbitrary advertisement that paid to be wallpapered onto it.