i'm always interested in things parked in car parking spaces. this tennis ball has pulled up rather far from the kerb and is not officially in a parking space.

'tennis ball' is a neat was of avoiding the congestion charge as I think it's in the exempt category.

there are two ways of travelling by tennis ball:
1) stand on top and run backwards, thus propelling yourself and the ball forward
2) lie flat with the tennis ball under you. pull yourself along with your hands with all your weight resting on the tennis ball. when the ball has reached the end of your body then either replace it yourself higher up your body or get a travelling companion to help.

method 2) is slightly more complicated, and because it leads to a slower method of travel, is probably best avoided on public roads.

my advice is stick to the pavement (stand on some chewing gum)