If ads were merely about being informative, they would be boring. But ads want to manipulate, so they have to be flashy and appeal to your emotions.
They pollute your mental headspace, and have no place in a healthy society.
Let's ban billboards. And then let's follow that up with a general purpose ban on paid advertisement.
Section 1. Ban on Commercial Advertisements All commercial advertisements, in any medium, are hereby prohibited throughout the United States.
Section 2. Definition For purposes of this Act, “commercial advertisement” means any paid or otherwise sponsored message intended to promote the sale or use of goods, services, or commercial ventures.
Section 3. Enforcement and Penalties Violations of this Act shall be subject to civil or criminal penalties as determined by the courts.
The thing is going to hit the courts anyways. Just craft it in a way that hits the Pareto curve on effectiveness vs legality.