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Developing a Guide for On-Bridge Stormwater Treatment Practices
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Michael Barrett National Cooperative Highway Research Program James Lenhart Lynn Katz Maral Razmand Jack Lisin Ariel Mosbrucker Aaron PoreskyWhile there has been extensive research and development of stormwater best management practices, there has been little focus on designs specific to the on-bridge environment. NCHRP Web-Only Document 401: Developing a Guide for On-Bridge Stormwater Treatment Practices, from TRB's National Cooperative Highway Research Program, is supplemental to NCHRP Research Report 1117: On-Bridge Stormwater Treatment Practices: A Guide and summarizes the conduct of research.
Developing a Guide for Rural Highways: Reliability and Quality of Service Evaluation Methods
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Scott S. Washburn National Cooperative Highway Research Program Bastian Schroeder Jorge Barrios Ana Moreno Sajid Raza Ahmed Al-KaisyTransportation agencies are charged with monitoring, maintaining, and improving rural highways of regional or statewide importance. NCHRP Web-Only Document 392: Developing a Guide for Rural Highways: Reliability and Quality of Service Evaluation Methods, from TRB's National Cooperative Highway Research Program, is a supplement to NCHRP Research Report 1102: Reliability and Quality of Service Evaluation Methods for Rural Highways: A Guide.
Developing a Guide for Transit Traction Power Cables
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Transit Cooperative Research Program Kasim A. KorkmazThe transit industry in the United States uses insulated cables for traction power supply and negative return cables between traction power substations, tie switches, and points of delivery to the vehicles, whether a third (contact) rail or an overhead contact system. TCRP Web-Only Document 77: Developing a Guide for Transit Traction Power Cables, from TRB’s Transit Cooperative Research Program, develops guidelines to determine when to replace transit system cables. The document is supplemental to TCRP Research Report 246: Transit Traction Power Cables: Replacement Guidelines.
Developing a Guide for Transporting Freight in Emergencies: Conduct of Research
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Jack Merritt National Cooperative Highway Research Program Curtis Morgan Jeffery Warner David Bierling Bradley Trefz Sushant SharmaCommercial vehicles delivering consumer goods must observe the applicable weight requirements and seek permits for oversize loads. NCHRP WOD 397: Developing a Guide for Transporting Freight in Emergencies: Conduct of Research, from TRB’s National Cooperative Highway Research Program, is a supplement to NCHRP Research Report 1115: Transporting Freight in Emergencies: A Guide on Special Permits and Weight Requirements.
Developing a Guide for Truck Parking Information Management Systems
by Chuck Miller Dan Murray Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Ernie Perry Matt Junak Gui Leao Chris Lindsey Peter RaffertySafe and efficient freight movement depends on sufficient and strategically located truck parking. Federal hours of service regulations require drivers to take breaks at defined intervals, leading to a search for parking ahead of their allowable drive time expires or while staging for their pick-up and delivery slots. This results in lost productivity, higher shipping costs, safety and environmental impacts of circulating trucks, and increased congestion. NCHRP Web-Only Document 415: Developing a Guide for Truck Parking Information Management Systems, from TRB’s National Cooperative Highway Research Program, is supplemental to NCHRP Research Report 1137: Guide for Truck Parking Information Management Systems.
Developing a Planning and Evaluation Guide for Active Traffic Management Strategies
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Ioannis Tsapakis Maya Bouchet Lisa Burgess Srinivasa Sunkari Kevin Balke Jeffrey Shelton Margaret Fowler Robert Brydia Beverly KuhnActive traffic management (ATM) has been a rapidly evolving concept, creating a need to provide guidelines to agencies considering these operational strategies for their jurisdictions. NCHRP Web-Only Document 402: Developing a Planning and Evaluation Guide for Active Traffic Management Strategies, is a supplemental document to NCHRP Research Report 1120: Active Traffic Management Strategies: A Planning and Evaluation Guide and updates and enhances the previously developed draft guide for planning and evaluating ATM for recurrent and nonrecurrent conditions. Two additional products are also available: a PowerPoint presentation providing an overview of the project and an Implementation Plan.
Development of a MASH Barrier to Shield Pedestrians, Bicyclists, and Other Vulnerable Users from Motor Vehicles
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program James Kovar Roger Bligh Shawn Turner Sun Hee Park Chiara Silvestri DobrovolnyAs the number of pedestrians, bicyclists, and users of other active transportation modes continues to grow in the United States, state departments of transportation and other transportation agencies are seeking to improve how these users are accommodated on or adjacent to our nation?s roadways. NCHRP Research Report 1116: Development of a MASH Barrier to Shield Pedestrians, Bicyclists, and Other Vulnerable Users from Motor Vehicles, from TRB's National Cooperative Highway Research Program, provides a detailed design for a crashworthy roadside barrier system for use alongside high-speed roadways that also addresses the needs of nonmotorized users of adjacent multiuse facilities. Supplemental to the report are: Survey, Crash Test Data, and Supporting Certification Documents: Appendices A, C, D, G, H, and I; Technical Drawings and Information for FHWA Eligibility Filing: Appendices B, E, F, and J; Technical Memo; PowerPoint Presentation; and NCHRP 22-37 Composite Crash Test Video.
Development of a New Highway Drainage Manual
by Scott Brown Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Dan Ghere Casey Kramer James D. SchallThe AASHTO Drainage Manual (ADM) (2014) provides a template and guidelines that facilitate state transportation agencies in the development of a highway drainage design manual. NCHRP Web-Only Document 423: Development of a New Highway Drainage Manual, from TRB's National Cooperative Highway Research Program, is a new, up?to?date highway drainage manual informed by the 2014 ADM and provides state and local transportation agencies with design guidelines, along with the technical background to support them.
Diagnostic Assessment and Countermeasure Selection: A Toolbox for Traffic Safety Practitioners
by John L. Campbell Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Behavioral Traffic Safety Cooperative Research Program Ingrid B. Potts Darren J. Torbic Audra K. Fraser Chris Monk Liberty Hoekstra-AtwoodSuccessful safety management practices require a thorough understanding of factors contributing to motor vehicle crashes. Continuous advancements in data-driven safety analysis, as well as the countermeasures and technologies available to address crashes, create challenges in maintaining a safety workforce proficient in the state of the practice. In many cases, agencies continue to use approaches such as descriptive statistics and anecdotal information to perform the diagnostic assessment without a thorough understanding of the expectations for a given context or road type. NCHRP Research Report 1111/BTSCRP Research Report 12: Diagnostic Assessment and Countermeasure Selection: A Toolbox for Traffic Safety Practitioners, from TRB's National Cooperative Highway Research Program and Behavioral Traffic Safety Cooperative Research Program, presents a toolbox to help highway safety practitioners diagnose contributing factors leading to crashes for use in selecting appropriate countermeasures. Supplemental to the report are a Conduct of Research Report, an Implementation of Findings, and a presentation.
Does the Built Environment Influence Physical Activity?: EXAMINING THE EVIDENCE
by Institute of Medicine of the National Academies Transportation Research BoardTRB Special Report 282: Does the Built Environment Influence Physical Activity? Examining the Evidence reviews the broad trends affecting the relationships among physical activity, health, transportation, and land use; summarizes what is known about these relationships, including the strength and magnitude of any causal connections; examines implications for policy; and recommends priorities for future research.
Effective Low-Noise Rumble Strips
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Shannon McKenna National Cooperative Highway Research Program Judith Rochat Carrie J. Janello Paul R. DonavanRumble strips are proven safety countermeasures for roadway departure crashes. They produce vibration and noise to alert drivers that they are drifting from the travel lane. Neighboring residents?contiguous to roadways with rumble strips?often complain about the noise generated by these appurtenances. This has prompted a need to simultaneously study noise mitigation and rumble strip design and application. NCHRP Research Report 1107: Effective Low-Noise Rumble Strips, from TRB’s National Cooperative Highway Research Program, proposes a rumble strip design that would minimize exterior noise on the outside of the vehicle yet generate sufficient auditory and vibratory response on the inside of the vehicle to alert the operator of a roadway lane departure. Supplemental to the report are Appendices A, B, C, D, and E and a presentation.
Electric Vehicle Charging Stations at Airport Passenger Parking Facilities
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Harshit Shukla Airport Cooperative Research Program Karim Lujan Jacqueline KuzioElectric vehicle (EV) sales in the United States have increased from around 100,000 in 2013 to more than one million in 2023. In turn, airports have installed charging stations to meet their customers? needs, prepare for expected demand, and comply with local ordinances. At least 93 out of the 145 hub airports are offering EV charging in their passenger parking facilities, up from 37 in 2014. ACRP Synthesis 138: Electric Vehicle Charging Stations at Airport Passenger Parking Facilities, from TRB’s Airport Cooperative Research Program, documents the current experience with EV charging at airports, specifically within passenger parking facilities. Although the use of EVs and the need for charging equipment exists across the airport, publicly accessible charging is a unique use case that presents a different set of challenges than either employee parking or fleet charging facilities.
Electronic Surveillance of Railroad-Highway Crossings for Collision Avoidance: State of the Practice
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Transit Cooperative Research Program Anurag Varma Ashish Varma Amiy VarmaTCRP Synthesis 177: Electronic Surveillance of Railroad-Highway Crossings for Collision Avoidance: State of the Practice, from TRB's Transit Cooperative Research Program, documents public transit agencies' current practices and lessons learned from rail service providers and others regarding the types, nature, implementations, successes, and failures of rail crossing electronic surveillance programs, particularly related to safety. This synthesis provides insights about the needs, decision criteria, measure of effectiveness, success factors, causes for failures, and selected implementations of rail crossing electronic surveillance programs, primarily for safety. The synthesis also discusses potential future advancements in rail crossing electronic surveillance.
Emerging Hazards in Commercial Aviation—Report 2: Ensuring Safety During Transformative Changes
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Committee on Emerging Trends in Aviation SafetyAs commercial aviation evolves, it is essential to ensure aviation safety as transformative technologies and new industry entrants emerge. Supporting the safe adoption of innovation will require updating Federal Aviation Administration (FAA) processes for certifying novel aircraft designs, developing performance-based standards for flight-critical functions, and improving data collection and analysis to detect potential safety issues. Strengthening safety culture at FAA and across the aviation industry is also necessary as new players and technologies are introduced. TRB Special Report 351: Emerging Hazards in Commercial Aviation—Report 2: Ensuring Safety During Transformative Changes, from the Transportation Research Board of the National Academies of Sciences, Engineering, and Medicine, was requested by Congress and FAA in order to help identify, monitor, understand, and address emerging aviation safety risks. This report marks the second installment of a series of six reports to be issued within a span of 10 years by the National Academies' Committee on Emerging Trends in Aviation Safety.
Evaluating Crashworthiness of Sign Supports and Breakaway Luminaire Poles: Appendices
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Cing-Dao Steve Kan Fadi Tahan Dhafer Marzougui Mohammadreza Rajaee Riley Ruskamp Chen Fang Cody Stolle Ronald Faller Robert Bielenberg Mojdeh Asadollahi PajouhRoadside safety features such as luminaire poles and sign supports are evaluated for crashworthiness using the AASHTO Manual for Assessing Safety Hardware (MASH) guidelines for crash testing. The updated preliminary testing protocols provide guidelines for evaluating families of related sign support and breakaway luminaire pole devices. NCHRP Web-Only Document 405: Evaluating Crashworthiness of Sign Supports and Breakaway Luminaire Poles: Appendices, from TRB’s National Cooperative Highway Research Program, is supplemental to NCHRP Research Report 1123: Guidelines for Evaluating Crashworthiness of Sign Supports and Breakaway Luminaire Poles.
Evaluating the Performance of Longitudinal Barriers on Curved, Superelevated Off-Ramps
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Fadi Tahan Dhafer Marzougui Kenneth S. Opiela Christopher Story Cing Dao Steve KanOff-ramp barriers are typically tested in straight, level conditions. However, real-world installations are often on curves with superelevation. This can affect how well they perform in crashes, especially when transitioning between highways and ramps. NCHRP Research Report 1138: Evaluating the Performance of Longitudinal Barriers on Curved, Superelevated Off-Ramps, from TRB’s National Cooperative Highway Research Program, aims to gain additional insights and establish guidelines relative to the crash performance of longitudinal barriers when placed on varying curved, superelevated ramp sections.
Examination of Transit Agency Coordination with Electric Utilities
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Transit Cooperative Research Program Lisa JerramPublic transit agencies across the United States are transitioning conventional bus fleets to battery electric buses (BEBs). This transition requires large investments in charging infrastructure as well as new demands on the power grid, which provides opportunities for partnership with electric utilities to upgrade grid supply and energy loads, and also to reduce costs during peak load. TCRP Synthesis 175: Examination of Transit Agency Coordination with Electric Utilities, from TRB’s Transit Cooperative Research Program, provides practitioners and operational staff at public transit bus agencies and electric utilities with the state of current practices by agencies and utilities that are collaborating on BEB planning and deployments.
Exploring Airport Employee Commuting and Transportation Needs
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Airport Cooperative Research Program C. Daniel PratherAirports face challenges recruiting and maintaining their workforce, and one reason is the employee commute. Airports are typically located further from residential areas and city centers, which can contribute to employee commuting time, method, and cost. ACRP Synthesis 136: Exploring Airport Employee Commuting and Transportation Needs, from TRB’s Airport Cooperative Research Program, describes how airport employees commute to and from work and how airports are seeking to influence employee transportation decisions.
Flood Forecasting for Transportation Resilience: A Guide
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Ashley Gordon National Cooperative Highway Research Program Max Kipp Emily Mills Katie Gronsky Seth Lawler Mathew MamparaTransportation systems are exposed to a diverse range of hazards, with flooding being one of the most common and consequential. State departments of transportation (DOTs) may use flood forecasts to inform actions such as issuing internal flood-level notifications, directing field staff to flood locations, and issuing road closures. A flood-forecasting capability can help inform a proactive approach to managing flood impacts by supporting preparation for events, fast response times, and efficient use of resources. NCHRP Research Report 1131: Flood Forecasting for Transportation Resilience: A Guide, from TRB's National Cooperative Highway Research Program, seeks to empower state DOTs with technical resources and organizational insights to better predict the timing and magnitude of flooding and enable advanced early warnings to help protect critical infrastructure and enhance roadway safety.
Geospatial Data Governance Policies and Procedures: A Guide
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Cindy Baldwin Rick Adams Airport Cooperative Research Program Laith Alfaqih Thomas Tiner Randy Murphy Elliot Rosales Kevin Shirer Carol Zuber-Mallison Ryan E. Bowe Eric RisnerMost airports, whether they realize it or not, use geospatial data. Traditionally, spatial data has been documented on paper to identify airport assets; as technology has progressed, information on spatial data has become more accurate. Today, geospatial software systems, such as geographic information systems, computer-aided design, and building information modeling, make acquiring and maintaining geospatial data easier. ACRP Research Report 278: Geospatial Data Governance Policies and Procedures: A Guide, from TRB’s Airport Cooperative Research Program, provides guidance to airport operators on how to create a data governance strategy for airports and stakeholders, including roles and responsibilities, policies, data collection standards, procedures, data exchange, security, and maintenance.
Global Pathways to Net-Zero: Behavioral, Social, and Technological Research and Innovation Strategies for Transportation Decarbonization; Summary of the Seventh EU-U.S. Transportation Research Symposium: Proceedings of a Symposium
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine Consensus and Advisory Studies DivisionThe climate crisis poses a threat to life on the planet, with human health, ecosystem, and economic impacts globally. These impacts are projected to worsen in the future, as greenhouse gas emissions continue to rise and warming to date continues to produce adverse effects. For example, in 2022 alone, the United States experienced 18 separate billion-dollar weather and climate disasters, totaling $165.1 billion. With the transportation sector being a leading source of emissions, it is essential that immediate steps are taken to decarbonize transportation and to continue to invest in the research needed for our decarbonization commitments to be met. Global Pathways to Net-Zero: Behavioral, Social, and Technological Research and Innovation Strategies for Transportation Decarbonization: Summary of the Seventh EU-U.S. Transportation Research Symposium: Proceedings of a Symposium, from the Transportation Research Board, summarizes a symposium held June 11–12, 2024, in Washington, DC. It was hosted by the U.S. Department of Transportation, the European Commission, and TRB.
Guide for Truck Parking Information Management Systems
by Chuck Miller Dan Murray Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Ernie Perry Matt Junak Gui Leao Chris Lindsey Peter RaffertyRecent studies of truck parking demand and capacity constraints reflect a consensus that truck parking demand exceeds the available supply in many public rest areas and private truck stops nationwide. NCHRP Research Report 1137: Guide for Truck Parking Information Management Systems, from TRB’s National Cooperative Highway Research Program, provides information on these systems that help address the need to provide safer parking options for commercial vehicle operators and reduce the time they take to search for parking through the collection and dissemination of real-time parking availability using a variety of technologies. Supplemental to the report is NCHRP Web-Only Document 415: Developing a Guide for Truck Parking Information Management Systems.
Guidelines for Evaluating Crashworthiness of Sign Supports and Breakaway Luminaire Poles
by Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Cing-Dao Steve Kan Fadi Tahan Dhafer Marzougui Mohammadreza Rajaee Riley Ruskamp Chen Fang Cody Stolle Ronald Faller Robert Bielenberg Mojdeh Asadollahi PajouhState departments of transportation employ numerous variations of luminaire and sign support systems that require evaluations for their crashworthiness. Guidelines for families of devices with similar crashworthy performance have the potential to reduce costs and promote compliance with the AASHTO Manual for Assessing Safety Hardware (MASH). NCHRP Research Report 1123: Guidelines for Evaluating Crashworthiness of Sign Supports and Breakaway Luminaire Poles, from TRB's National Cooperative Highway Research Program, presents research results and preliminary guidelines for evaluating families of devices for sign supports and breakaway poles under MASH. Supplemental to the report is NCHRP Web-Only Document 405: Evaluating Crashworthiness of Sign Supports and Breakaway Luminaire Poles: Appendices.
Implementing Machine Learning at State Departments of Transportation: A Guide
by Kaan Ozbay Kelly Bare Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Haley Townsend Matthew Samach Sherif Ishak Mecit CetinWithin the last two decades, Machine Learning (ML), the main subfield of Artificial Intelligence (AI), has gained significant momentum across all sectors, driven by a confluence of factors: exponential growth in data generation, advancements in data storage and computing, and innovations in algorithmic techniques. Most notably and recently, the proliferation of deep learning (DL) methods and generative AI tools (GATs) such as ChatGPT are revolutionizing the business landscape. In an era where data is pouring in from new sources, the pace of data growth is exceeding the pace at which state and local Departments of Transportation (DOTs) are able to use it. NCHRP Research Report 1122: Implementing Machine Learning at State Departments of Transportation: A Guide, from TRB's National Cooperative Highway Research Program, serves as both an education and a decision-making tool to assist state DOTs and other transportation agencies in identifying promising ML applications; assessing costs, benefits, risks, and limitations of different approaches; and building a data-driven organization conducive to capitalizing on and expanding ML capabilities in a broad spectrum of transportation applications. Along with supplemental files, there is an associated publication, NCHRP Web-Only Document 404: Implementing and Leveraging Machine Learning at State Departments of Transportation, which documents the overall research effort.
Implementing and Leveraging Machine Learning at State Departments of Transportation
by Kaan Ozbay Transportation Research Board National Academies of Sciences, Engineering, and Medicine National Cooperative Highway Research Program Haley Townsend Matthew Samach Sherif Ishak Mecit CetinThere is enormous potential for Machine Learning (ML) to transform state Departments of Transportation (DOTs), by strategizing and deploying ML solutions that improve transportation safety, efficiency, equity, and sustainability. NCHRP Web-Only Document 404: Implementing and Leveraging Machine Learning at State Departments of Transportation, from TRB’s National Cooperative Highway Research Program, is the conduct of research report for NCHRP Project 23-16 and documents the state of the art and state of the practice on ML; presents case studies on ML applications; and compiles ML tools and sample ML applications. NCHRP Web-Only Document 404 is a supplement to NCHRP Research Report 1122: Implementing Machine Learning at State Departments of Transportation: A Guide.