VMT

The downward slide continues.

We continue our Streetfacts series by looking at the data on driving in the U.S. Per-capita driving has declined every year since 2005. That's not a blip, it's now an 8-year trend.

If Jane Doe rides her bike a mile to the post office and then back home, is it fair to assume she just avoided two miles of driving? And can we then assume that she prevented 2.2 pounds of carbon dioxide from being emitted?

For decades -- through the rise of the two-car household, women entering the workforce, the growth of the exurbs -- Americans reliably put more miles on their cars every year.

After seven years of declines, traffic deaths in America rose again in 2012, according to a preliminary estimate by the National Safety Council.

We've had a busy two weeks since the Transportation Research Board conference, and one thing that’s slipped through the cracks is passing on a few tidbits that came at the end of the TRB panel of U.S. DOT officials on January 16.

While governors debate raising (or eliminating) their states' gas taxes, buzz is building about mileage-based fees, or a vehicle-miles-traveled charge. A House provision to ban U.S. DOT from studying such a fee has gone away (along with its sponsor), while Rep. Earl Blumenauer is trying to get the Treasury Department to look into how it could work. And a new report from the Government Accountability Office says that would be a good idea.

It's well-established that density and mixed-use development reduce driving. Right? But strategies like those don’t work the same way everywhere, according to new research published in the Journal of Transport and Land Use. While in major cities, denser development is linked to lower rates of driving, researchers found that in smaller cities it might not have much effect at all. The research suggests that for smaller cities, a focus on reducing block sizes and improving street connectivity may be the most effective way to cut down on driving, though the authors caution that more research is needed to draw universal conclusions.

In June, the House of Representatives voted to ban U.S. DOT from even studying the viability of switching from the gas tax to a vehicle-miles-traveled (VMT) fee. But the tide may be turning: The sponsor of the amendment, Rep. Chip Cravaack, has been ousted from Congress, the amendment itself is on the skids, and a new bill would actually require the government to study the VMT option.