No wake zones

[tis]

If the law was meant to be headway speed why don't they use headway speed signs like they used to.

Sorry, I don't think headway speed and no wake are the same thing and I don't think when you see a No Wake sign that the intention is to allow one to go headway speed no matter how much wake you are making. If the law was properly written we obviously would not have differing opinions on this.