Case Study: Successes in Seattle with Transportation Demand Management

Many jurisdictions have embraced transportation demand management (TDM) programs as a way to reduce vehicle miles traveled (VMT), especially for work trips. Seattle, Washington has been particularly successful with its TDM measures, achieving a 70% non-single occupancy vehicle (SOV) mode share as of 2016 (Fig. 1). All this was accomplished at a time when Seattle was experiencing significant growth in both its population and its central business district (Fig. 2). From 2010 to 2016, downtown Seattle added 45,000 jobs, yet 95% of the gain in net commute trips were by means other than SOVs....

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