Car

Cars or automobiles were a very common means of transport for Humans on Earth during the 20th and 21st centuries.

21st century
Luke Rattigan created ATMOS, a device which stopped cars from producing C02. In actuality, ATMOS would enable a Sontaran invasion of Earth (DW: The Sontaran Stratagem/The Poison Sky).

Advancements
In the far future cars such as the New Earth Car could hover. (DW: New Earth, Gridlock).