What is the cost of the Smart Pass decal? Drivers can register for a decal at no cost. March 21, 2016 09:01 Related articles Who can get an HOV Smart Pass decal? How is the Smart Pass decal enforced? Where should the Smart Pass decal be placed on my car? I've moved here from another state. How do I register my vehicle in Tennessee? What is the minimum markup increase set by the Unfair Cigarette Sales Law?