Publications

Find publications about alternative transportation, including alternative fuels, advanced vehicles, and regulated fleets.

Search Results | 3 publications
Title Author Date Category
Measuring Fundamental Improvements in Sustainable Urban Mobility: The Mobility-Energy Productivity Metric Garikapati, V.; Young, S.; Hou, Y. 7/9/2019 Conference Papers & Proceedings

National Renewable Energy Laboratory, Golden, Colorado

Recent technological advancements in mobility are creating many options for connecting citizens with employment, goods, and services, particularly in urban areas where modes such as bike and car shares, electric scooters, ridesourcing, and ridesharing are proliferating at a rapid pace. Analysis and tools for overall transportation planning are dominated by urban regional travel demand models whose roots in highway operations poorly reflect the system dynamics in denser areas where parking costs, convenience, and availability - not to mention sustainability concerns and quality of life - are driving people to an ever-greater spectrum of mobility services. In this paper, we present a new paradigm for evaluating mobility options within an urban area. First developed for the U.S. Department of Energy's Energy Efficient Mobility System research program, this metric is termed the Mobility-Energy Productivity (MEP) metric. At its heart, the MEP metric measures accessibility and appropriately weights it with travel time, cost, and energy of modes that provide access to opportunities in any given location. The proposed metric is versatile in that it can be computed from readily available data sources or derived from outputs of regional travel demand models. End times associated with parking, curb access, cost, and reliability and frequency of service need to be carefully considered to obtain an appropriate and accurate perspective when computing the metric based on outputs from regional travel demand models. Ultimately, the MEP metric can be used to reflect the impacts of new mobility technologies (transportation network companies, electric scooters), business models (car shares and bike shares), and land-use practices (such as transit-oriented development) on sustainable urban mobility. This paper lays out the need, requirements, and framework for this new metric, and offers it, in collaboration with the American Society for Civil Engineers (ASCE), as a foundational metric for Smart City assessment.

Novel and Practical Method to Quantify the Quality of Mobility: Mobility Energy Productivity Metric Hou, Y.; Garikapati, V.; Nag, A.; Young, S.E.; Grushka, T. 5/10/2019 Journal Articles & Abstracts

National Renewable Energy Laboratory, Golden, Colorado

Recent technology innovations are enabling fundamental improvements in mobility systems, including options for new travel modes, methods, and opportunities to connect people with goods, services, and employment. A desire to quantify and compare both existing and emerging transportation options motivated development of the mobility energy productivity (MEP) metric described here. The MEP metric fundamentally measures the potential of a city's transportation system to connect a person to a variety of services and activities that define a high quality of life, relative to the convenience, cost, and energy needed to provide these connections. Fundamentally derived from accessibility theory, the MEP advances practice by using readily available travel time data (either from web-based application programming interfaces or outputs from an urban transportation model) combined with established parameters that reflect the energy intensity and cost of various travel modes, and relative frequency of activity engagement. The construction of the MEP metric allows for aggregation and disaggregation to the appropriate spatial, modal, and trip purpose resolution, as analysis needs dictate. The MEP could be used to compare alternative futures related to technology, infrastructure investment, or policy, providing a much-needed tool for planners, researchers, and analysts.

Notes: This journal article is copyrighted by National Academy of Sciences: Transportation Research Board (Vol. 2673(10) 141-152) and available on the Sage Publications website.

Moving Together in the 21st Century: How Ridesharing Supports Livable Communities Kay, M.; McCoy, K.; Lyons, W.M. 6/1/2013 Reports

U.S. Department of Transportation, Research and Innovative Technology Administration, John A. Volpe National Transportation Systems Center, Cambridge, Massachusetts

This white paper is a follow-up to the Volpe Center report for FHWA, "Ridesharing Options Analysis and Practitioners' Toolkit." The white paper provides an update to current ridesharing options and further explores technology and policy developments that make new methods of ridesharing possible. In addition, the report assesses ridesharing as a key contributing factor to supporting livable communities, and in particular, how ridesharing can be part of a "tipping point" in reducing the need for vehicle ownership and demand for parking.