Before you can get cars off the roads. You firstly need to get coppers out there in cars and on foot, sorting out the lil scrotes, the muggers and the thieves. The councils out there cleaning up the streets and repair crews sorting out the buses and shelters etc
then get the buses running 24 hours with a route no more than 5 minutes from anybodies house
Re-Nationalise the Railway network and running 24 hours
Subsidise the public transport to make it cheaper than your car
Oh and then subsidise the freight companies so that your food is cheaper so you don't need to do a monthly shop (using your car)
Oh and could that all be done with out a massive tax hike
NO
Oh dear the greenies are flogging a dead horse
People will always use cars and won't give a flying F*** about the environment then just as long as they can survive