Roadside Advertising translation
I am trying to find a Spanish translation for "BIll Board". That is, the giant advertising boards you see on the sides of the main roads.
Thanks
5 Answers
Hi! There are many ways to call them.
The most proper is "Vallas publicitarias".
But you can also say: "carteles", "anuncios", "avisos", "propaganda", "carteles publicitarios".
Greetings.
Anuncios is most common, its kind of a one size fits all here in the north of Mexico
valla publicitaria
Fun fact--did you know roadside advertising on most highways in Spain is banned? That´s why, when traveling from region to region, you won´t see any billboards. Except the occasional BULL-board, which doesn´t have any writing and stands out as a silouhette in the distance. It´s actually an ad for wine. But most people would never know, since it is just a bull, sitting there on the mountain.
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A few more:
cartelera, barda de anuncios, valla para anuncios
"Valla publicitaria" appears most commonly and foremost, as has been noted earlier, even though "valla" is more readily translated as "fence" - probably since most ads (bills) were posted on fences & fence posts back in the day! 
