The survey article recently posted (“The Simple Math Of Complex Cities“) provides a nice, quick overview of current findings that show the economic benefits of active mobility. For an exhaustive analysis of this field, the Victoria Transport Policy Institute, arguably Canada’s foremost centre for this research, has just published “Evaluating Active Transportation Benefits and Costs”. (download PDF)
The report “describes methods for evaluating the benefits and costs of active transport (walking, cycling, and their variants). It describes various types of benefits and costs and methods for measuring them. It discusses active transport demands and ways to increase walking and cycling activity.”
The report also includes an extensive bibliography of current research articles.