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? I've moved here from another state. How do I register my vehicle in Tennessee? Where should the Smart Pass decal be placed on my car? What is the minimum markup increase set by the Unfair Cigarette Sales Law?