TRB's National Cooperative Highway Research Program (NCHRP) has released a pre-publication, non-edited version of Report 835: Guidelines for Implementing Managed Lanes. The report provides implementation guidance for transportation agencies interested in designing, implementing, operating, and maintaining managed lanes. Guidance includes ways to define initial objectives, outline the necessary ...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 832: State DOTs Connecting Specialized Transportation Users and Rides, Volume 1: Research Report provides resources for agencies and organizations with practices for connecting specialized transportation users with the rides they need to access daily services. Within this report are the findings from a literature review, intervi...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 832: State DOTs Connecting Specialized Transportation Users and Rides, Volume 2: Toolkit for State DOTs and Others assists agencies and organizations with the process of designing, developing, implementing, and evaluating linkages that connect customers of specialized transportation services and programs with rides. The stand-al...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 830: Multi-State, Multimodal, Oversize/Overweight Transportation is a compilation of existing permitting requirements for the transportation of oversize/overweight (OSOW) freight throughout the United States. It identifies and presents information about state-by-state differences in OSOW road transportation regulations and permi...

TRB's National Cooperative Highway Research Program (NCHRP) Report 829: Leadership Guide for Strategic Information Management for State Departments of Transportation assists executives and managers with developing and maintaining an agency’s capability to provide timely, high-quality, mission-critical information. The guidebook includes components of an effective information governance strategy...

TRB's National Cooperative Highway Research Program (NCHRP) Report 828: Guidelines for Nighttime Visibility of Overhead Signs explores legibility distances for drivers in controlled conditions and the effects of sign luminance and visual complexity on the distance at which a driver can read overhead signs and street signs. While the Manual on Uniform Traffic Control Devices (MUTCD) provides min...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 827: Navigating Multi-Agency NEPA Processes to Advance Multimodal Transportation Projects analyzes approaches taken by state departments of transportation (DOTs), their local partners, and other project sponsors to satisfy National Environmental Policy Act (NEPA) requirements for transportation projects involving more than one m...

TRB's National Cooperative Highway Research Program (NCHRP) Report 826: Estimating Highway Preconstruction Services Costs presents guidance for state departments of transportation (DOTs) and other agencies for estimating preconstruction services (PCS) costs for transportation project development. PCS refers to a varied assortment of project-specific engineering and other professional services r...

TRB's National Cooperative Highway Research Program (NCHRP) Report 826: Estimating Highway Preconstruction Services Costs presents guidance for state departments of transportation (DOTs) and other agencies for estimating preconstruction services (PCS) costs for transportation project development. PCS refers to a varied assortment of project-specific engineering and other professional services r...

TRB's National Cooperative Highway Research Program (NCHRP) Report 825: Planning and Preliminary Engineering Applications Guide to the Highway Capacity Manual will help planners apply the methodologies of the 6th Edition of the Highway Capacity Manual (HCM) to common planning and preliminary engineering analyses, including scenario planning and system performance monitoring. It shows how the HC...

TRB's National Cooperative Highway Research Program (NCHRP) Report 824: Methodology for Estimating the Value of Travel Time Reliability for Truck Freight System Users describes a survey methodology and develops a Truck Freight Reliability Valuation Model to estimate the value of travel time reliability for truck freight system users for evaluating proposed highway infrastructure and operat...

TRB's National Cooperative Highway Research Program (NCHRP) Report 823: Guidelines for Certification and Management of Flexible Rockfall Protection Systems provides advice on rockfall fence systems for transportation agencies. It also outlines data that are needed to evaluate the results of rockfall fence systems tested using the procedure recommended for acceptance. Finally, the report present...

TRB's National Cooperative Highway Research Program (NCHRP) Report 822: Evaluation and Assessment of Environmentally Sensitive Stream Bank Protection Measures evaluates and assesses existing guidelines for the design, installation, monitoring, and maintenance of environmentally sensitive stream bank stabilization and protection measures, and develops quantitative engineering design guidance for...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 821: Effective Project Scoping Practices to Improve On-Time and On-Budget Delivery of Highway Projects demonstrates how a state department of transportation (state DOT) can enhance its scoping process and practices to produce a project cost estimate and schedule that facilitate improved programming decision making and accountabi...

TRB's National Cooperative Highway Research Program (NCHRP) Report 819: Self-Consolidating Concrete for Cast-in-Place Bridge Components presents recommended guidelines for the use of self-consolidating concrete (SCC) in cast-in-place highway bridge components. These guidelines address the selection of constituent materials, proportioning of concrete mixtures, testing methods, fresh and hardened...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 818: Comparing the Volumetric and Mechanical Properties of Laboratory and Field Specimens of Asphalt Concrete provides proposed practices for evaluating the causes and magnitude of variability of specimen types tested in quality control and assurance programs for asphalt paving projects.

TRB’s National Cooperative Highway Research Program (NCHRP) Report 817: Validation of Guidelines for Evaluating the Moisture Susceptibility of WMA Technologies presents validated guidelines proposed for identifying potential moisture susceptibility in warm mix asphalt (WMA) during mix design. The report further corroborates the moisture susceptibility thresholds described in NCHRP Report 763 : ...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 816: Guide for the Preservation of Highway Tunnel Systems provides guidance on making informed decisions using an asset management process to support prioritization of highway tunnel preservation actions. The guide explains how executives can incorporate and communicate capital funding needs for tunnel improvements as part of th...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 815: Short-Term Laboratory Conditioning of Asphalt Mixtures develops procedures and associated criteria for laboratory conditioning of asphalt mixtures to simulate short-term aging. The report presents proposed changes to the American Association of State Highway and Transportation Officials (AASHTO) R 30, Mixture Conditioning o...

TRB’s National Cooperative Highway Research Program (NCHRP) Report 814: Data to Support Transportation Agency Business Needs: A Self-Assessment Guide provides methods to evaluate and improve the value of their data for decision making and their data-management practices. NCHRP Web-Only Document 214 : Transportation Agency Self-Assessment of Data to Support Business Needs: Final Research Report ...