Digging up part of Bristol's Clifton Downs to build an underground car park has been suggested as a means of tackling congestion.

BBC: Clifton Suspension Bridge

The proposals for the Robinsons Brewery complex, in Ulverston, involve a supermarket and underground car park, with up to 200 jobs promised.

BBC: Opposition mounts over Ulverston brewery store plan

They were tested in an underground car park and in London's Hyde Park, where they were propped up against trees to determine the most effective background colours and reading distances.

BBC: The road sign as design classic