Study Shows Mixed Use Reduces Car Travel More Than Density

Smart Planet talks with transportation researcher Reid Ewing about a new study he co-authored about how different development patterns can reduce auto use.

But it's not just density that helps reduce car use. In fact, the study fond that mix of uses has more of an impact on reducing car use than density.

"Planners for the last 40 years have been calling for mixed-use development, but we haven't known how beneficial mixed-use development was in terms of discouraging driving and encouraging walking and transit use. The study provides an estimate [of] just how important it is to balance jobs and housing in a neighborhood, rather than having all housing or all jobs.

The study made an attempt to generalize across something like 60 individual studies. It provides measures that can be used by planners and by policy makers to evaluate development proposals, to do health impact assessments, to do climate action plans.

If California metropolitan areas, under their smart growth climate law, double the density of their regions over the next 20 years, what effect will that have on total vehicle miles and total emissions? Now there's a convenient way of summarizing the effects. We can say with some certainty that if you double density you'll get a five to 10 percent reduction in vehicle miles traveled."

Full Story: Minimizing car travel by changing how we think about development


Prepare for the AICP* Exam

Join the thousands of students who have utilized the Planetizen AICP* Exam Preparation Class to prepare for the American Planning Association's AICP* exam.
Starting at $245
AICP CTP Storefont Display

The first online AICP* CTP exam prep class

Are you ready to take the AICP* Certified Transportation Planner exam?
Priced at $245 for May exam!
Book cover of Unsprawl

Unsprawl: Remixing Spaces as Places

Explore visionary, controversial and ultimately successful strategies for building people-centered places.
Starting at $12.95
Red necktie with map of Boston

Tie one on to celebrate your city

Choose from over 20 styles of neckties imprinted with detailed city or transit maps.