'Milennials' (everyone born between 1980 and 2000) are having a significant impact on transportation these days because researchers are intrigued by their attitudes toward driving and other things too.

If you listen to this group, the “driving boom is over,” or so says a new study of American attitudes towards the automobile.

After decades of adding more cars to their household fleet while moving further and further out into the suburbs, Americans are waiting longer to get licensed, driving less and increasingly turning to alternatives such as mass transit or car-sharing programs, according to a new study by the U.S. Public Research Interest Group, or PIRG.

A recent report from the Detroit Bureau says that "the time has come for America to hit the reset button on transportation policy—replacing the policy infrastructure of the driving boom years with a more efficient, flexible and nimble system that is better able to meet the transportation needs of the 21st century."

The changes are apparent among virtually all demographic groups, but especially so with Millennials. They’re showing an increased desire to move back into urban centers where cars are often a hindrance, and they are increasingly turning to mass transit – a factor that can be seen in a steady growth in ridership on both city bus and rail systems and even the long-struggling Amtrak.

Is that relevant for you? Do you seen any subtle changes in your community?

If some teens are waiting longer to pursue a driver's license, where's the harm in that? If that means some of us are a little bit older, and hopefully wiser when we undertake the huge privilege and responsibility of driving, that should mean more responsible thinking behind the wheel too.

Having viable transportation options should matter to people of all ages, whether they live in the higher population centers or not. It's just that the only place where viable transit options can be explored is where the cost can be justified and the only place for that is where the population density reaches critical mass...

All the research on consumer attitudes from folks of all ages cannot change the laws of math & physics.