TDM: The Logistics of Moving People
Guest post by Rico Fleshman
Often overlooked or altogether omitted from discussions of transportation logistics is the field of transportation demand management (TDM). Whereas traditional transportation logistics is concerned with the streamlined movement of freight and goods through existing infrastructure, TDM deals with the efficacy in the movement of people and sustainable transportation options, challenging the notions of single-occupant vehicle use.
TDM programs are developed by local public agencies, some with the support of public-private partnerships, and are generally geared towards congestion mitigation and reduction of the corresponding emissions. These programs define and refine strategies to create transportation options such as telecommuting, biking, walking, ridesharing, and using transit and to establish more effective land use policies to lessen the negative impact of population growth on transportation.
With the Intermodal Surface Transportation Efficiency ACT (ISTEA) of 1991, lawmakers established a federal focus on the improvement of environmental programs and authorized the Congestion Mitigation and Air Quality Improvement (CMAQ) program. CMAQ has been re-authorized in legislation to-date and continues to support surface transportation programs in areas of poor air quality (nonattainment) by providing grant funds for development and support of TDM programs at the state and local levels.
Federal formula programs also provide support to the development and sustainment of TDM programs. Some authorized programs target specific segments of the population, such as low-income, elderly, or disabled persons, while other forms of formula funding provide operating and capital assistance to transit agencies in both rural and urbanized areas. Most recently, Moving Ahead for Progress in the 21st Century (MAP-21) has sought to streamline formula program administration by consolidating some programs and doing away with others.
Both CMAQ and formula program (capital assistance) grants have commonly been used in support of TDM programs and are administered by both the Federal Highway Administration and the Federal Transit Administration.
In recent years, TDM advocates--state and local agencies, private companies and transportation associations--have been able to expand the reach and scope of programs to impact congestion and emissions relief. But, there are limitations. Whereas issues with transportation logistics can be rectified by the building out of infrastructure or optimization in vehicle design, TDM is focused on the individual and therefore tied to personal behavior change. Funding for the industry is still nominal, compared to its road-based counterpart and that is due in part to TDM programmer’s ability to effectively demonstrate that behavior change to lawmakers.
TDM advocates continue to lobby for funding tied to performance measures, as they purport their programs to be vastly more effective than engineering infrastructure. The problem here is that there are few, if any, systems that comprehensively demonstrate throughput and effectively captures and consolidates system usage with quantifiable data.
Advances in technology and continued investments in outreach have allowed TDM programs to leverage greater public/private partnerships and garner more private sector employer support to bolster the programs. In effect, they continue to grow. Vanpooling and carpooling programs have exploded throughout the country, biking and walking programs receive greater visibility and participation, and transit usage continues to increase as communities are built around public transportation options.
Once a burgeoning movement, TDM has quickly become a way of life. It has well established its usefulness and purpose and continues to be an invaluable part of the transportation field.
About the Author
Rico Fleshman is the Corporate and Strategic Manager: Transportation, Logistics and Supply Chain for American Public University. He has worked with numerous transportation associations and has extensive knowledge of federal and state transportation policy, funding, metropolitan planning processes and regulatory compliance of transportation programs. For information on the online Transportation, Logistics and Supply Chain programs at APU, visit StudyatAPU.com.
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