If you drive a vehicle that meets certain emissions standards and other criteria, you may be able to get Clean Air Vehicle (CAV) decals and a CAV decal identification (ID) card, which allow single occupancy use of High Occupancy Vehicle (HOV, or carpool) lanes.
More information about HOV
https://www.flhsmv.gov/motor-vehicles-tags-titles/high-occupancy-vehicle-decal/
