1. Abstract Transportation sustainability is of increasing concern to professionals and the public. This project describes the modeling and calculation of sustainability performance measures in a transportation data archive. The purpose of these measures is to assess the sustainability of Portland, Oregon’s metropolitan freeway system. The measures were developed to be part of, and use the data from, the PORTAL regional transportation data archive at Portland State University. They estimate vehicle emissions (CO, VOC, NO x, and CO2), fuel consumption, cost of time delay, and person mobility (travel in person-hours and person-miles, and delay in person-hours). Methods for modeling and necessary data are described in the project paper. In the future, plans call for integrating these measures into the PORTAL web interface to expand the types of performance measures used for regional transportation planning and operations. Objectives Internationally, road transport is the largest anthropogenic source of urban air pollution. Beyond emissions, transportation is a heavy user of society’s time and energy resources. This project investigated performance indicators that specifically address economic, environmental, and social sustainability. The objective was to establish modeling and calculation procedures for sustainability performance measurement that can be incorporated into the PORTAL data archive for regional performance reporting, planning and operations. Data PORTAL has been gathering and archiving transportation data since 2004. Approximately 600 inductive loop detectors on Portland's metropolitan freeways are the primary data sources for PORTAL. Data collected at 20-second intervals is streamed to the PORTAL servers, including count, occupancy and time mean speeds in each lane. PORTAL also includes incident and variable message sign data since 1999, one year’s worth of stop-level bus data and hourly and daily weather conditions in Portland from automated weather stations. Conclusion The “green” performance measures described in this project for emissions, fuel consumption, delay cost, and person mobility will add a new dimension to the PORTAL data archive. They offer key transportation system sustainability indicators that can readily be calculated from existing PORTAL data. While these measures can offer new insights, their limitations must also be understood. They rely on the accuracy of the archived data as well as the models. Future work should focus on increasing the accuracy of these estimates by obtaining higher resolution Portland-specific data and refining the model inputs. The next step in this project will be online, automated implementation of these measures based on the methods described here. Acknowledgements Funding and support for this project is provided by the National Science Foundation, Oregon Department of Transportation, Federal Highway Administration, City of Portland, TriMet and Metro. Special thanks to the PORTAL development team, PORTAL users and the TransPort ITS committee for their feedback and support. www.its.pdx.edu Greening PORTAL: Adding Sustainability Performance Measures to a Transportation Data Archive Alexander Bigazzi and Dr. Robert Bertini, Portland State University Fuel Consumption Person Measures Delay Cost Emissions estimates were calculated from emissions rates generated by the U.S. EPA’s MOBILE 6 average speed emissions model Input ParameterData Source(s) Difficulty to Obtain General Sensitivity of Performance Measures Hourly VMT PORTAL Low High Hourly Speed Distributions PORTAL Low High Vehicle Fleet PORTAL and Averages Med Medium – High Inspection Programs OR DEQ and Averages Med-High Low Fuel Programs US EPA and Averages Med-High Low – Medium Weather PORTAL Low Sample estimates from I-5 NB at Broadway (MP 302.5, a 1.4 mile section): Fuel Consumption was calculated from MOBILE 6 fleet fuel economy estimates (around 17mpg). These are not speed-based estimates, but dependent primarily on fuel and emissions programs and vehicle usage. Delay cost calculations were based on ODOT time value estimates and auto/truck splits. Auto and truck time values for 2008 were around $18 and $27, respectively, per vehicle-hour. Person-miles of travel, person-hours of travel, and person-hours of delay were calculated from ODOT vehicle occupancy estimates and auto/truck splits. Auto and truck occupancies were around 1.55 and 1.07, respectively. As can be seen in the figures above, different emissions respond to traffic conditions in different ways. Congestion can have both magnifying and mitigating effects on vehicle pollutant and greenhouse gas emissions. Sample from I-5 NB at Broadway: Sample from I-5 NB at Broadway