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In London, the majority of driver still use their car for trip under 3km/day.
Not everyone lives in London ;)
When I moved back to London after a year away, I sold my car within 6 months as it was pretty much useless. bought another one later on though... I last lived in the UK in Surbiton and worked near Heathrow. 16 miles and I either rode to work or drove as public transport was a bastard. Three buses at least and the best part of two hours each way including waiting for buses. Sure, I'd chosen to live there but you can't move every time you get a new job.
Depends where you live. Not everyone lives in cities or places well served by public transport.
Probably a fair point for most owners of them and other car types. A guy I know has a pickup and the most he puts in the back is the shopping or the bikes; he got it as he likes the image he thinks it projects (outdoorsy, manly sort of vibe is what he's going for).
Problem is that car ownership is too connected to an image people want to project or that other people expect of them and their perceived place in the world.