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? Where should the Smart Pass decal be placed on my car? How is the Smart Pass decal enforced? I've moved here from another state. How do I register my vehicle in Tennessee? Can I receive a refund for the unused portion of my motor vehicle registration?