Many Utah cities are trying to clamp down on electronic billboards. Here's the part of the story you probably didn't hear: This new advertising option is great for small advertisers.
Say there are 10 northbound billboards on Interstate 15 in the Salt Lake Valley. In any given month, 10 businesses would contract with a billboard company and pay from $5,000 to $10,000 per month for that space.
Since companies aren't allowed to build any more billboards, that limited supply means the price just keeps going up. In the future only big advertisers like Coca-Cola or Larry H. Miller will be able to afford billboards.