Depends how you define "voluntarily", but it does appear some developed countries have slightly lower kms-traveled-by-private-vehicle per citizen now than they

Depends how you define "voluntarily", but it does appear some developed countries have slightly lower kms-traveled-by-private-vehicle per citizen now than they did 10 or 20 years ago (e.g. there was a study done in the UK in 2012 showing a 4% drop since the late 90s). It'd be good to find some more recent and easily accessible references.