Could a folding car solve parking problems?
Have you ever driven through a city centre and spent ages looking for somewhere to park?
In many urban areas, there simply isn't enough space for all the cars that people want to use.
And it doesn't just create parking problems - it also means inevitable traffic jams.
As part of the BBC's What If? season, Theo Leggett has been looking at high-tech solutions to traffic problems, including a car that folds itself to fit in a smaller space.
- BBC News