Induced Demand

In case you need an easy link to reference when encountering arguments in favor of widening roads and freeways as a solution for traffic, Adam Mann provides an accessible and clear explainer article that sums up the limitations of such strategies.
Jun 18, 2014   Wired
Despite many studies confirming the effect of induced traffic, the effect is often ignored in the transport models used for project appraisal, says a team of Scandanavian researchers creating an extreme bias in the assessment of new projects.
Jun 25, 2012   European Journal of Transport and Infrastructure Research
Eric Jaffe at The Infrastructurist explains the non-intuitive reason why often removing freeways means less traffic.
Jun 7, 2011   The Infrastructurist
Dan Bertolet argues that adding expanding car capacity in cities just inspires more people to drive and ruins the qualities that make the city attractive in the first place.
Sep 5, 2010   Publicola