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One of the critical issues in terms of car use, is the amount of space they take up in terms of the actual carriageway. But one of the ways cars really ruin urban environments is through car parking, which spends most of the time vacant but is a necessity to facilitate car ownership.
Car use costs local authorities and TfL an absolute fortune just for maintenance!
Bear in mind car ownership is falling across London. In places like Lambeth only about 1/3 of households actually own a car.
I got a broken ruler.
Umm surely someone has worked it out before though.
Actually if you find the data on total length of roads in London. (within m25 or something) and you estimate the width of find avg width of road you could get an estimate.
To much for my brain though.
https://data.london.gov.uk/dataset/length-road-network-borough-and-region
might help?