Hovercars were advanced cars which possessed the ability to hover over the ground.
Hovercars were present on Earth along with hovertrucks by the year 2018. (TV: The Enemy of the World)
The New York Police Department also made use of hovercars as police vehicles during the 21st century. (PROSE: Cat's Cradle: Warhead)
The Sleeze Brothers, a pair of New York City private investigators owned a Volkswagen Beetle hovercar. (COMIC: Follow that TARDIS!)
The poodles of dogworld travelled using hovercars by the 2070s. (PROSE: Mad Dogs and Englishmen)
Bryn owned a hovercar. (PROSE: A Good Life)
The Second Doctor, Polly, Nesca Bangate, Harriet Quilp and Meg Carvossa all use one at some point during the robot rights protest of New Houston. (AUDIO: The Yes Men)
Dorium Maldovar owned a hovercar which was damaged whilst he was travelling to the Beacon with the Eleventh Doctor. This accident damaged Dorium's data pad. (AUDIO: The Light Keepers)
In a parallel universe, hovercars were a commonly-used method of transit on Skaro by the Kaleds and Thals. Davros and Charn owned one. (AUDIO: Palindrome)