Dynamic isochronic map of the London Underground

This isochronic Tube map really is quite cool. It isn't nearly as pretty as this one, but what it lacks in aesthetics it makes up for in dynamism and utility. Back when I didn't have a car I used to wonder what a map like this would look like for all of public transportation in the Bay Area. How warped would a map look if space was adjusted for travel time from Mulford Hall? I guess all the urban areas would be all scrunched together.