MassDOT Evidence-Based Policy Making for Transportation Demand Management (TDM)

cars driving

IEc is currently conducting a multi-phase project to assist MassDOT in understanding interventions that work for reducing single occupancy vehicle (SOV) driving. We first developed a taxonomy of transportation demand management (TDM) interventions, including outreach, ride-matching and sharing, parking management, infrastructure investments, land use/zoning policy, public transportation investments, congestion pricing, and other financial incentives. We identified peer-reviewed and gray literature on these interventions and their effectiveness, screening for criteria such as study design, response rate, and proper use of statistical methods. We identified interventions with a positive evidence base, i.e., the interventions that were shown in the literature to produce a reduction in SOV travel and/or an increase in alternative travel modes. IEc characterized the magnitude and reliability of these effects, and analyzed factors that influence intervention success. We then developed detailed case studies on several TDM interventions with a positive evidence base, including public transit subsidies, parking policies, and land use interventions.

Currently, we are developing a large-scale survey to better understand commuting options and considerations. MassDOT will distribute this survey to EZ-Pass holders in Massachusetts. The survey will explore commuter understanding of commuting options, barriers to mode shift, and perspectives on current MassDOT outreach and incentives for public transportation and carpooling. Survey results will be used to inform MassDOT’s future TDM programming and interventions.

Client Massachusetts Department of Transportation