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National Cooperative Highway Research Program

A forum for coordinated and collaborative research, the National Cooperative Highway Research Program (NCHRP) addresses issues integral to the state Departments of Transportation (DOTs) and transportation professionals at all levels of government and the private sector. The NCHRP provides practical, ready-to-implement solutions to pressing problems facing the industry.

The NCHRP is administered by the Transportation Research Board (TRB) and sponsored by the member departments (i.e., individual state departments of transportation) of the American Association of State Highway and Transportation Officials (AASHTO), in cooperation with the Federal Highway Administration (FHWA). Individual projects are conducted by contractors with oversight provided by volunteer panels of expert stakeholders.

ANNOUNCEMENTS
NCHRP has partnered with AASHTO to develop a Transportation TV Special Report video on Automated Vehicles in America, featuring the results of Strategies to Advance Automated and Connected Vehicles: Briefing Document. It provides 18 policy and planning options for government decision makers that could influence the private sector to deploy automated vehicle technology in ways that will help to achieve societal goals. The briefing document is based on NCHRP Research Report 845: Advancing Automated and Connected Vehicles: Policy and Planning Strategies for State and Local Transportation Agencies.

 

The AASHTO Special Committee on Research and Innovation will meet on April 9-10, 2019, to select projects for the NCHRP's FY 2020 program. 

NCHRP 2018 Annual Report

During 2018, NCHRP completed 150 research projects, published 68 research products, and approved 58 new and continuation projects. This Annual Report provides a concise list of research published in 2018 and a list of all active projects, projects completed in 2018, and projects that were approved in 2018 but are not yet under contract. The Annual Report also presents detailed information about how NCHRP operates with oversight by the AASHTO Special Committee on Research and Innovation

An implementation facilitation plan for NCHRP research results was prepared for the AASHTO Standing Committee on Research and approved in December 2015. 

Evaluating Implementation of NCHRP Products: Building on Successful Practices identifies the four key elements to successful implementation: implementation leadership, buy-in, structural support and resources, and ready-to-use products. Ten case studies of selected NCHRP products highlight a range of effective approaches to implementation.

Information on all projects initiated under the NCHRP from its inception in 1962 through 1988 is included in NCHRP Web Document 7: Special Edition of Summary of Progress through 1988.

Unfunded NCHRP problem statements can now be found on AASHTO's Research Program and Project Management site.

IMPACTS ON PRACTICE

Among the variety of methods the National Cooperative Highway Research Program uses to showcase the value of NCHRP research is a series of success stories titled Impacts on Practice. These brief case studies highlight how transportation agencies have put critical NCHRP research results to use nationwide in the following areas:

  • Administration and Management
  • Traffic and Safety
  • Construction and Materials
  • Design 
  • Environment, Energy, and Planning
  • Maintenance and Preservation 
QUICK RESPONSE RESEARCH FOR AASHTO COMMITTEES
  • Standing Committee on Highways
  • Standing Committee on Planning
  • Standing Committee on the Environment
  • Standing Committee on Public Transportation
NCHRP PUBLICATIONS

NCHRP Reports, Syntheses of Practice, Research Results Digests, Web-Only Documents, and Legal Research Digests contain the findings of individual research projects managed by TRB's Cooperative Research Programs.

  • Reports: Reports are the main product of the research project and are often written as guidebooks or manuals.
  • Syntheses of Practice: Syntheses report on the state of the practice based on literature reviews and surveys of recent activities about innovations being used by others to solve problems.
  • Research Results Digests (RRDs): RRDs are used to promote early awareness of project results in order to encourage implementation.
  • Legal Digests (LRDs): LRDs report on timely legal issues, compile case law, or recommend specific solutions to specific problems.
  • Web-Only Documents: Web-only documents are fully searchable PDFs of contractor-prepared reports or supporting appendix materials.
  • Selected Studies in Transportation Law: The SSTL series is jointly published by the National Cooperative Highway Research Program (NCHRP) and the Transit Cooperative Research Program (TCRP).
RECENT PUBLICATIONS


Manual on Subsurface InvestigationsManual on Subsurface Investigations
February 6, 2019
TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 258: Manual on Subsurface Investigations provides an update to the American Association of State Highway Transportation Officials (AASHTO) 1988 manual of the same name. This report reflects the changes in the approaches and methods used for geotechnical site characterization that the geotechnical community has develop...

Development of Roundabout Crash Prediction Models and Methods Development of Roundabout Crash Prediction Models and Methods
January 21, 2019
TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 888: Development of Roundabout Crash Prediction Models and Methods provides crash prediction models that quantify the expected safety performance of roundabouts for motorized and non-motorized road users. Safety performance factors (SPF) and crash modification factors (CMF) are predictive models that estimate expected c...

Analyzing Data for Measuring Transportation Performance by State DOTs and MPOsAnalyzing Data for Measuring Transportation Performance by State DOTs and MPOs
January 17, 2019
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 528: Analyzing Data for Measuring Transportation Performance by State DOTs and MPOs summarizes what data state departments of transportation (DOTs) and metropolitan planning organizations (MPOs) are using and how they are measuring transportation performance. Knowledge about transportation data already exists, but may be...

Resilience in Transportation Planning, Engineering, Management, Policy, and AdministrationResilience in Transportation Planning, Engineering, Management, Policy, and Administration
January 14, 2019
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis Report 527: Resilience in Transportation Planning, Engineering, Management, Policy, and Administration 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, maint...

Dedicating Lanes for Priority or Exclusive Use by Connected and Automated VehiclesDedicating Lanes for Priority or Exclusive Use by Connected and Automated Vehicles
January 11, 2019
TRB’s National Cooperative Highway Research Program (NCHRP) Research Report 891: Dedicating Lanes for Priority or Exclusive Use by Connected and Automated Vehicles identifies and evaluates opportunities, constraints, and guiding principles for implementing dedicated lanes for connected and automated vehicles. This report describes conditions amenable to dedicating lanes for users of these vehic...

Benchmarking and Comparative Measurement for Effective Performance Management by Transportation AgenciesBenchmarking and Comparative Measurement for Effective Performance Management by Transportation Agencies
January 11, 2019
TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publicaiton, non-edited version of Research Report 902: Benchmarking and Comparative Measurement for Effective Performance Management by Transportation Agencies. The report provides guidance and examples for how transportation agencies can ensure that benchmarking is effectively applied to enhance transportation syst...
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