I did some research locally some years ago which suggested that 97% of adult cycle owners also own a car (this is Surrey after all). The corresponding figure for car-cycle ownership was 50%. The dataset I used is a local Market Town survey (for Dorking) with 1304 respondents from something like 8500 questionnaires within a population catchment of 20-25,000...so a pretty solid survey.
Using regional cycle ownership stats (from NTS, I have copies in Excel format) in combination with census data, it's possible to put good total numbers to that (although I didn't bother for that particular exercise...we get a lot of visiting cyclists which add to the total cycling data for the town, but no-one has been able to quantify that element).
I did, however, calculate the total number of cycle owners in the UK, 23.5m, 25% of whom live in London and the South East (I have a table I developed providing cycle ownership numbers by region and, if I remember, age). Statistical accuracy on numbers at regional level is probably between +/-5 and +/-10%, though I'm not sure what statistical resolution is achieved by the NTS methodology so can't be any clearer than that. I'd note, however, the NTS is based on a very small sample of, I understand, no more than 20,000 travel diaries covering the whole of the UK, of which significantly fewer are fully completed.
If you want any more info on the survey the reports and associated analyses can be downloaded from:
http://www.dorkingdna.org/
I was the transport director for that project so if anyone has any questions please contact me.
Cheers
John Meudell
-----Original Message-----
From: Cycling and Society Research Group discussion list [mailto:[log in to unmask]] On Behalf Of Peter R.H. Wood
Sent: 24 February 2012 11:11
To: [log in to unmask]
Subject: Cyclists who are drivers
Hiya,
Is there any decent data telling me how many cyclists are also drivers, and vica versa?
Obviously there are numerous quantitative and qualitative ways of interpreting how much driving or cycling you have to do to be classed a driver or cyclist, all interpretations would interesting.
Pete
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