Evaluating transportation programs: neglected principles

This article provides guidance for the effectiveness evaluation of transportation programs. It discusses the importance of determining the significance of changes in outcome measures before versus after implementation of transportation programs. The article reviews common weaknesses in example evaluations, and points to remedies, including structuring controls to help determine the effects of transportation programs, and applying readily available statistical tests to determine the significance of measured outcomes. This revised version was published online in June 2006 with corrections to the Cover Date.