AASHTO CA12-4

This brief is the twelfth in a series of briefs that constitute a body of knowledge describing
commuting in America. This body of work, sponsored by American Association of State
Highway and Transportation Officials (AASHTO) and carried out in conjunction with a
National Cooperative Highway Research Program (NCHRP) project that provided supporting
data, builds on three prior Commuting in America documents that were issued over the
past three decades. Unlike the prior reports that were single volumes, this effort consists of
a series of briefs, each of which addresses a critical aspect of commuting in America. These
briefs, taken together, comprise a comprehensive summary of American commuting. The
briefs are disseminated through the AASHTO website (www.transportation.org). Accompanying
data tables and an Executive Summary complete the body of information known as
Commuting in America 2013 (CIA 2013).