TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 246: Volume 1: TRAQS User Guide provides guidance for using the TRansportation Air Quality System (TRAQS). TRAQS is an open source software designed to conduct mobile air quality assessments for three primary purposes: Project-Level Conformity (Hot-Spot Analyses) National Environmental Policy Act (NEPA) General Transportation Planning TRAQS is designed to streamline the model process and minimize any limitations of standalone s...

TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 246: Volume 2: TRAQS: A Combined Interface for Project-Level Air Quality Analysis documents the development of TRAQS (TRansportation Air Quality System), a Graphical User Interface-based software application that simplifies project-level air quality analysis of mobile source emissions. TRAQS integrates the “modeling chain” components of traffic activity, mobile emissions, and air dispersion modeling. TRAQS is designed to stream...

TRB's Transit Cooperative Research Program (TCRP) Research Report 195: Broadening Understanding of the Interplay Among Public Transit, Shared Mobility, and Personal Automobiles explores the effects of app-based transportation network companies on the cities in which they operate, including on public transit ridership, single-occupancy vehicle trips, and traffic congestion. Built upon the findings of TCRP Research Report 188 , this report explores how shared modes—and ridesourcing companies in particular—...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 520: Integrated Transportation and Land Use Models presents information on how select agencies are using sketch planning models and advanced behavioral models to support decision making. The synthesis describes the performance of these models and the basic principles of land use/transport integration.

TRB's National Cooperative Highway Research Program (NCHRP) Research Report 868: Cell Phone Location Data for Travel Behavior Analysis presents guidelines for transportation planners and travel modelers on how to evaluate the extent to which cell phone location data and associated products accurately depict travel. The report identifies whether and how these extensive data resources can be used to improve understanding of travel characteristics and the ability to model travel patterns and behavior more e...

The National Academies of Sciences, Engineering, and Medicine has released a summary the presentations and discussions from a June 28-29, 2016, workshop that explored the results of years of investment, experimentation, and research in building resilience and examined experiences in building more resilient communities. Over the past decade, resilience has gained significant traction across the nation and innovative programs are showing exciting progress in building resilient communities. For communities ...

TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 515: Practices for Preventing Roadway Departures identifies and summarizes practices being used by state departments of transportation (DOTs) to prevent roadway departure crashes and to identify the data-driven advantages and disadvantages of these practices. More than half of all traffic fatalities result from roadway departure crashes. This type of crash occurs after a vehicle crosses an edge line or centerline or otherwise leaves th...

TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Synthesis 527: Resilience in Transportation Planning, Engineering, Management, Policy, and Administration. The report documents resilience efforts and how they are organized, understood, and implemented within transportation agencies’ core functions and services. Core functions and services include planning, engineering, construction, maintenance, operations, and administration. The informati...

TRB's E-Circular 233: Applying Census Data for Transportation explores a conference held on November 14-16, 2017, in Kansas City, Missouri that focused on the use of census data for transportation applications. The conference provided a forum for participants to share experiences with the use of Census data, including new techniques for integrating different data sets for use in transportation planning and decision making. The conference further provided an opportunity for participants to discuss opportu...

TRB's Transit Cooperative Research Program (TCRP) has released a pre-publication, non-edited version of Research Report 201: Understanding Changes in Demographics, Preferences, and Markets for Public Transportation. The report explores how changes in demographics, traveler preferences, and markets for public transportation affect transit ridership now and in the future. The report explores how an individual’s demographics affect their longterm values, their current attitudes, and the type of neighborhood...