I suppose that there are three main ways to to decrease VMT.
1) Increased non car travel efficiencies,
living closer to work, school ,and stores
Better mass transit--bus and train
bikes instead of cars
2) ideological changes.
this would have to do with changing peoples perceptions of the other modes of transport.
Can you imagine PSAs that actually portray the many downsides to driving.
3) Rising costs associated with VMT.
Longer commutes than other alternatives
Less time to do other things. Imagine trains and busses with internet connections
slow commutes—stress and lack of physical activities.
car taxes -- what about a tax for your 3rd car?
Things that raise the VMT-
Cheaper fuel, related to this is better gas mileage
lack of transportation alternatives
nice long distance roads to places that people travel
low gas taxes
Media portrayal of cars as desirable, fun and exciting.
Selling pro-car ideology to children at the toystore and playground