New Earth car
From Tardis Wiki, the free Doctor Who reference
New Earth cars were the usual transport on New Earth. They were a hovering version of 21st century cars.
Thousands of cars were trapped in the Motorway, under the city of New New York, for twenty-three years. It would take months just to go one mile (although the whole motorway just went in circles). The Tenth Doctor opened the door and allowed the drivers to escape.
The New Earth cars had several features including self-replicated fuel and bunk beds. They could recycle human waste into food.
The words Bad Wolf appeared on the side of a Japanese New Earth car. (DW: Gridlock)