By ignoring the travel times, the CEO for Cities study argues, the TTI report churns out apples-to-oranges congestion figures.

FORBES: Chris Christie and the Highway Spenders

Over the past year, our officials have clarified the requirements for travel for purposes of tourism, work, and study, and we intend to streamline this process in order to make travel easier.

WHITEHOUSE: The White House

Last year, CEOs for Cities released a detailed response to the Texas Transportation Institute (TTI) report, faulting the study for failing to include travel times, an omission that tilts the results in favor of metro regions splayed out.

FORBES: Chris Christie and the Highway Spenders

As for the gender demographics of study abroad programs, more women than men travel overseas to study.

BBC: The statistics of studying abroad

HILLSBORO, Oregon (CNN) -- One of Derek Smith's first assignments as the corporate sustainability manager for the catalog and retail company Norm Thompson Outfitters was to travel to California to study the environmental impact of cotton growing.

CNN: Catalog company going lean and green

Because of the internal travel restrictions, people who want to move from one Palestinian city to another for work or study must register a change of address to make sure they can stay there.

ECONOMIST: The Palestinians

They factored in passengers' travel patterns, the airports' geographic locations, interactions between airports and even passenger waiting times for their study, published July 19 in the journal PLoS ONE.

CNN: Researchers list top 10 airports for spreading disease