This report reviews State Department of Transportation (DOT) practices related to bridge load rating, posting, and permitting procedures, analyzing publicly available documents. It examines previous versions of the National Bridge Inspection Standards (NBIS) and the most recent 2022 update, alongside the AASHTO Manual for Bridge Evaluation (MBE) an
...
Dahlberg, J., Liu, Z., & Phares, B. (2024). Advances in State Bridge Load Rating Processes and Practices: A Summary Report of 2024 Bridge Load Rating Peer Exchanges (Report No. FHWA-HIF-24-113). United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure. https://rosap.ntl.bts.gov/view/dot/80605
Dahlberg, Justin, Zhengyu Liu, and Brent Phares. Advances in State Bridge Load Rating Processes and Practices: A Summary Report of 2024 Bridge Load Rating Peer Exchanges. Report no. FHWA-HIF-24-113. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure, 2024. https://rosap.ntl.bts.gov/view/dot/80605.
Dahlberg, Justin, et al. Advances in State Bridge Load Rating Processes and Practices: A Summary Report of 2024 Bridge Load Rating Peer Exchanges. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure, 2024, Report no. FHWA-HIF-24-113, ROSA P. https://rosap.ntl.bts.gov/view/dot/80605.
The purpose of this techbrief is to highlight the research performed to evaluate the appropriateness and applicability of Light Detection and Ranging (LiDAR) sensors for collecting vulnerable road user count data under variable conditions that can provide information for measuring exposure to crash risk.
Calvo, J., Jannat, M., Chao, S. F., Salerno, C., Young, D., Olko, S., & Beuse, P. A. (2024). Enhancing Vulnerable Road User Detection and Volumetric Data Quality With Lidar Sensors [TechBrief] (Report No. FHWA-HRT-25-007). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology. https://doi.org/10.21949/1521523
Calvo, Jose, Mafruhatul Jannat, Szu-Fu Chao, Corrigan Salerno, Destinee Young, Sarah Olko, and Pascal A. Beuse. Enhancing Vulnerable Road User Detection and Volumetric Data Quality With Lidar Sensors [TechBrief]. Report no. FHWA-HRT-25-007. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024. https://doi.org/10.21949/1521523.
Calvo, Jose, et al. Enhancing Vulnerable Road User Detection and Volumetric Data Quality With Lidar Sensors [TechBrief]. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024, Report no. FHWA-HRT-25-007, ROSA P. https://doi.org/10.21949/1521523.
This techbrief discusses how leveraging pocket lidar (PL) technology has become very important in for many purposes of construction. Traditionally, the construction industry has been slow to adopt digital technology for various reasons. This research delves further into this issue and discusses current methods used and a deep dive into PL technolog
...
Olsen, M., Che, E., Jung, J., & Caya, J. (2024). Leveraging Pocket Lidar for Construction Inspection and Digital As-Builts — Phase 1 [TechBrief] (Report No. FHWA-HRT-25-017). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/1521533
Olsen, Michael, Ezra Che, Jaehoon Jung, and John Caya. Leveraging Pocket Lidar for Construction Inspection and Digital As-Builts — Phase 1 [TechBrief]. Report no. FHWA-HRT-25-017. United States. Department of Transportation. Federal Highway Administration, 2024. https://doi.org/10.21949/1521533.
Olsen, Michael, et al. Leveraging Pocket Lidar for Construction Inspection and Digital As-Builts — Phase 1 [TechBrief]. United States. Department of Transportation. Federal Highway Administration, 2024, Report no. FHWA-HRT-25-017, ROSA P. https://doi.org/10.21949/1521533.
For this technote, the research team collaborated with the Pennsylvania Department of Transportation (PennDOT) to perform the following tasks: Assess the ability of pocket lidar (PL) to perform 3D reconstruction of a trench and the accuracy of that 3D reconstruction. Evaluate the accuracy of derivative metrics extracted from the PL point cloud data
...
Che, E., Olsen, M., Caya, J., & Roe, G. (2024). Pocket Lidar for Trench Measurement [TechNote] (Report No. FHWA-HRT-25-015). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology. https://doi.org/10.21949/1521531
Che, Ezra, Michael Olsen, John Caya, and Gene Roe. Pocket Lidar for Trench Measurement [TechNote]. Report no. FHWA-HRT-25-015. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024. https://doi.org/10.21949/1521531.
Che, Ezra, et al. Pocket Lidar for Trench Measurement [TechNote]. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024, Report no. FHWA-HRT-25-015, ROSA P. https://doi.org/10.21949/1521531.
Automated vehicle (AV) functionality depends on perceiving and understanding the surrounding roadway environment and infrastructure elements. SAE International® Level 2™ driving automation systems use sensors to perceive the environment and maintain a set headway with lead vehicles while remaining centered in the lane (SAE International, 2020). Alt
...
Sanchez, R., Ahmed, A., Chao, S. F., Weaver, S., Eisert, J., & Cobb, D. P. (2024). Effects of Vehicle Automation and Cooperative Driving Messaging on Driver Behavior When Passing a Bicyclist on a Shared Roadway (Report No. FHWA-HRT-25-019). United States. Federal Highway Administration. Office of Safety and Operations Research and Development. https://doi.org/10.21949/1521536
Sanchez, Robert, Ananna Ahmed, Szu-Fu Chao, Starla Weaver, Jesse Eisert, and Douglas P Cobb. Effects of Vehicle Automation and Cooperative Driving Messaging on Driver Behavior When Passing a Bicyclist on a Shared Roadway. Report no. FHWA-HRT-25-019. United States. Federal Highway Administration. Office of Safety and Operations Research and Development, 2024. https://doi.org/10.21949/1521536.
Sanchez, Robert, et al. Effects of Vehicle Automation and Cooperative Driving Messaging on Driver Behavior When Passing a Bicyclist on a Shared Roadway. United States. Federal Highway Administration. Office of Safety and Operations Research and Development, 2024, Report no. FHWA-HRT-25-019, ROSA P. https://doi.org/10.21949/1521536.
This report assists public agencies in the inventorying, documenting, and configuring traffic management system (TMS) assets, and illustrates how such information can support the management of these assets. It provides information for agencies to establish and manage their TMS asset inventories. This document addresses key factors in determining wh
...
MacAdam, J., Belella, P., Lukasik, D., & Sanchez, R. (2024). Inventorying, Documenting, and Configuring Traffic Management System (TMS) Assets and Resources (Report No. FHWA-HRT-25-031). United States. Federal Highway Administration. Office of Safety and Operations Research and Development. https://doi.org/10.21949/1521542
MacAdam, John, Paul Belella, Dan Lukasik, and Robert Sanchez. Inventorying, Documenting, and Configuring Traffic Management System (TMS) Assets and Resources. Report no. FHWA-HRT-25-031. United States. Federal Highway Administration. Office of Safety and Operations Research and Development, 2024. https://doi.org/10.21949/1521542.
MacAdam, John, et al. Inventorying, Documenting, and Configuring Traffic Management System (TMS) Assets and Resources. United States. Federal Highway Administration. Office of Safety and Operations Research and Development, 2024, Report no. FHWA-HRT-25-031, ROSA P. https://doi.org/10.21949/1521542.
This report examines emerging data sources applicable to traffic simulation model calibration. The project team categorized these data sources based on publicly accessible datasets and emphasized their potential use for enhancing traffic simulation model calibration. The study evaluates the strengths and limitations of these emerging data sources a
...
Zhou, X. (., Luo, X. (., Abbasi, M., Huang, Z., & Tyagi, A. (2024). Emerging Data Cleaning and Fusion for Traffic Model Calibration–Data Fusion for Microsimulation Model Calibration (Report No. FHWA-HRT-24-142). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/1521587
Zhou, Xuesong (Simon), Xiangyong (Roy) Luo, Mohammad Abbasi, Zhitong Huang, and Ankur Tyagi. Emerging Data Cleaning and Fusion for Traffic Model Calibration–Data Fusion for Microsimulation Model Calibration. Report no. FHWA-HRT-24-142. United States. Department of Transportation. Federal Highway Administration, 2024. https://doi.org/10.21949/1521587.
Zhou, Xuesong (Simon), et al. Emerging Data Cleaning and Fusion for Traffic Model Calibration–Data Fusion for Microsimulation Model Calibration. United States. Department of Transportation. Federal Highway Administration, 2024, Report no. FHWA-HRT-24-142, ROSA P. https://doi.org/10.21949/1521587.
United States. Department of Transportation. Federal Highway Administration. Office of Operations
2024-12-01
|
Urban Congestion Report (UCR)
|
PDF
The Urban Congestion Report (UCR) is produced on a quarterly basis and characterizes the most recent traffic congestion and reliability trends at the national and city level. Each quarterly UCR compares data from the most recent three months to the same three months in the previous year.
United States. Department of Transportation. Federal Highway Administration. Office of Operations (2024). Urban Congestion Report (UCR): Year-to-Year Trends in the U.S. for October through December 2024. United States. Department of Transportation. Federal Highway Administration. Office of Operations. https://rosap.ntl.bts.gov/view/dot/87763
United States. Department of Transportation. Federal Highway Administration. Office of Operations. Urban Congestion Report (UCR): Year-to-Year Trends in the U.S. for October through December 2024. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2024. https://rosap.ntl.bts.gov/view/dot/87763.
United States. Department of Transportation. Federal Highway Administration. Office of Operations Urban Congestion Report (UCR): Year-to-Year Trends in the U.S. for October through December 2024. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/87763.
Driver assistance systems that facilitate economical driving (eco-driving) aim to reduce greenhouse gas emissions and improve vehicle efficiency. These systems reduce idling time at intersections and smooth acceleration and deceleration patterns. Eco-driving has the potential to improve driving comfort by smoothing speed profiles. This study explor
...
Sanchez, R., Ahmed, A., Chao, S. F., Weaver, S., & Eisert, J. (2024). Exploring the Effects of Vehicle Automation and Cooperative Messaging on Mixed Fleet Eco-Drive Interactions (Report No. FHWA-HRT-24-169). United States. Federal Highway Administration. Office of Safety and Operations Research and Development. https://doi.org/10.21949/1521613
Sanchez, Robert, Ananna Ahmed, Szu-Fu Chao, Starla Weaver, and Jesse Eisert. Exploring the Effects of Vehicle Automation and Cooperative Messaging on Mixed Fleet Eco-Drive Interactions. Report no. FHWA-HRT-24-169. United States. Federal Highway Administration. Office of Safety and Operations Research and Development, 2024. https://doi.org/10.21949/1521613.
Sanchez, Robert, et al. Exploring the Effects of Vehicle Automation and Cooperative Messaging on Mixed Fleet Eco-Drive Interactions. United States. Federal Highway Administration. Office of Safety and Operations Research and Development, 2024, Report no. FHWA-HRT-24-169, ROSA P. https://doi.org/10.21949/1521613.
United States. Department of Transportation. Federal Highway Administration
2024-12-01
|
PDF
This document provides a summary of Exploratory Advanced Research (EAR) funded research projects; it is a compendium of papers covering the following topics: Mobile Ad Hoc Networks, Digital Twins, Supplementary Materials, Artificial Intelligence (AI), Blockchain, Waste Plastics in Asphalt Binders, Interagency Research.
United States. Department of Transportation. Federal Highway Administration (2024). Exploratory Advanced Research (EAR) Program Compendium of Papers from Funded Research Projects - Updated for 2024 (Report No. FHWA-HRT-25-018). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/1521535
United States. Department of Transportation. Federal Highway Administration. Exploratory Advanced Research (EAR) Program Compendium of Papers from Funded Research Projects - Updated for 2024. Report no. FHWA-HRT-25-018. United States. Department of Transportation. Federal Highway Administration, 2024. https://doi.org/10.21949/1521535.
United States. Department of Transportation. Federal Highway Administration Exploratory Advanced Research (EAR) Program Compendium of Papers from Funded Research Projects - Updated for 2024. United States. Department of Transportation. Federal Highway Administration, 2024, Report no. FHWA-HRT-25-018, ROSA P. https://doi.org/10.21949/1521535.
The Federal Highway Administration's Long-Term Pavement Performance (LTPP) program issues a triannual newsletter to inform you about the progress and activities of the program. Brief updates on progress in important program activities are provided, including data collection, data releases, new products and publications, pooled fund studies, and dat
...
Long-Term Pavement Performance Program (U.S.) (2024). LTPP Newsletter - December 2024 - Fall Issue (Report No. FHWA-HRT-25-048). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/1521550
Long-Term Pavement Performance Program (U.S.). LTPP Newsletter - December 2024 - Fall Issue. Report no. FHWA-HRT-25-048. United States. Department of Transportation. Federal Highway Administration, 2024. https://doi.org/10.21949/1521550.
Long-Term Pavement Performance Program (U.S.) LTPP Newsletter - December 2024 - Fall Issue. United States. Department of Transportation. Federal Highway Administration, 2024, Report no. FHWA-HRT-25-048, ROSA P. https://doi.org/10.21949/1521550.
During a full-scale fatigue test program at Lehigh University performed in 2018, the fatigue performance of a prototype orthotropic steel deck (OSD) with extended cut-out (EC) rib-to-floor beam (RFB) connections with partial joint penetration (PJP) welds and reinforcing fillet welds which wrap-around at the weld termination was investigated. The fu
...
Hodgson, I., Sause, R., & Kozy, B. M. (2024). Improving the Manufacturability of Extended Cut-Out Rib-to-Floor Beam Connections for Orthotropic Steel Decks (Report No. 24-01). Lehigh University. https://rosap.ntl.bts.gov/view/dot/79025
Hodgson, Ian, Richard Sause, and Brian M. Kozy. Improving the Manufacturability of Extended Cut-Out Rib-to-Floor Beam Connections for Orthotropic Steel Decks. Report no. 24-01. Lehigh University, 2024. https://rosap.ntl.bts.gov/view/dot/79025.
Hodgson, Ian, et al. Improving the Manufacturability of Extended Cut-Out Rib-to-Floor Beam Connections for Orthotropic Steel Decks. Lehigh University, 2024, Report no. 24-01, ROSA P. https://rosap.ntl.bts.gov/view/dot/79025.
United States. Department of Transportation. Federal Highway Administration. Office of Operations
2024-12-01
|
National Travel Time Dashboard: Interstate Highways
|
PDF
The Monthly Urban Congestion Report (UCR) provides a state-level overview of traffic congestion and reliability trends on Interstate highways. Published every month, the report compares data from the most recent month with the same month in the previous year. It uses travel time data from the Federal Highway Administration’s National Performance Ma
...
United States. Department of Transportation. Federal Highway Administration. Office of Operations (2024). National Travel Time Dashboard: Interstate Highways, December 2024. United States. Department of Transportation. Federal Highway Administration. Office of Operations. https://rosap.ntl.bts.gov/view/dot/87941
United States. Department of Transportation. Federal Highway Administration. Office of Operations. National Travel Time Dashboard: Interstate Highways, December 2024. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2024. https://rosap.ntl.bts.gov/view/dot/87941.
United States. Department of Transportation. Federal Highway Administration. Office of Operations National Travel Time Dashboard: Interstate Highways, December 2024. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/87941.
Short-span bridge superstructures are commonly made of precast concrete elements, and those elements are proportioned according to the properties of conventional concrete. The emergence of ultra-high-performance concrete (UHPC), and the release of the AASHTO Guide Specification for Structural Design with UHPC, creates new possibilities for the rede
...
Garber, D., El-Helou, R., & Graybeal, B. A. (2024). Section Shapes for Short-Span UHPC Bridges (Report No. FHWA-RC-24-0009). United States. Federal Highway Administration. Office of Technical Services. https://rosap.ntl.bts.gov/view/dot/82189
Garber, David, Rafic El-Helou, and Benjamin A. Graybeal. Section Shapes for Short-Span UHPC Bridges. Report no. FHWA-RC-24-0009. United States. Federal Highway Administration. Office of Technical Services, 2024. https://rosap.ntl.bts.gov/view/dot/82189.
Garber, David, et al. Section Shapes for Short-Span UHPC Bridges. United States. Federal Highway Administration. Office of Technical Services, 2024, Report no. FHWA-RC-24-0009, ROSA P. https://rosap.ntl.bts.gov/view/dot/82189.
This TechNote covers the research conducted regarding how key features such as vertical alignment is inspected and measured during construction and the challenges and solutions performed properly so that improper placement or damage on the retaining walls - mechanically stabilized earth (MSE) can be detected in a timely manner.
Che, E., Thorsen, M., & Roe, G. (2024). Pocket Lidar for Assessing Mechanically Stabilized Earth (MSE) Retaining Wall for Bridge Abutments [TechNote] (Report No. FHWA-HRT-25-013). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology. https://doi.org/10.21949/1521529
Che, Ezra, Mitch Thorsen, and Gene Roe. Pocket Lidar for Assessing Mechanically Stabilized Earth (MSE) Retaining Wall for Bridge Abutments [TechNote]. Report no. FHWA-HRT-25-013. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024. https://doi.org/10.21949/1521529.
Che, Ezra, et al. Pocket Lidar for Assessing Mechanically Stabilized Earth (MSE) Retaining Wall for Bridge Abutments [TechNote]. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024, Report no. FHWA-HRT-25-013, ROSA P. https://doi.org/10.21949/1521529.
The reconstruction of the Federal Highway Administration’s (FHWA) third-generation Pavement Testing Facility (PTF-3) provided a unique opportunity to incorporate the geotechnical aspects of pavements within the agency’s accelerated pavement testing program. These geotechnical aspects included various unbound and asphalt-treated base materials to es
...
Adams, M. T., Nicks, J., Zuniga, I. E., Ghaaowd, I. I., & Culbreth, N. (2024). Selection and Characterization of the Foundation Materials for the Third-Generation FHWA Pavement Test Facility (Report No. FHWA-HRT-25-023). United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development. https://doi.org/10.21949/1521622
Adams, Michael T., Jennifer Nicks, Isaac E Zuniga, Ismaail I. Ghaaowd, and Nicholas Culbreth. Selection and Characterization of the Foundation Materials for the Third-Generation FHWA Pavement Test Facility. Report no. FHWA-HRT-25-023. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development, 2024. https://doi.org/10.21949/1521622.
Adams, Michael T., et al. Selection and Characterization of the Foundation Materials for the Third-Generation FHWA Pavement Test Facility. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development, 2024, Report no. FHWA-HRT-25-023, ROSA P. https://doi.org/10.21949/1521622.
United States. Department of Transportation. Federal Highway Administration
2024-12-01
|
PDF
A product of the Federal Highway Administration's (FHWAs) Safety Research and Development Program, the Interactive Highway Safety Design Model (IHSDM) is a suite of safety analysis tools to evaluate the safety and operational effects of geometric-design decisions on two-lane rural highways. The following resources are available to individuals consi
...
United States. Department of Transportation. Federal Highway Administration (2024). IHSDM Resource List [December 2024] (Report No. FHWA-HRT-24-180). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/1521518
United States. Department of Transportation. Federal Highway Administration. IHSDM Resource List [December 2024]. Report no. FHWA-HRT-24-180. United States. Department of Transportation. Federal Highway Administration, 2024. https://doi.org/10.21949/1521518.
United States. Department of Transportation. Federal Highway Administration IHSDM Resource List [December 2024]. United States. Department of Transportation. Federal Highway Administration, 2024, Report no. FHWA-HRT-24-180, ROSA P. https://doi.org/10.21949/1521518.
The use of nondestructive evaluation (NDE) for the condition assessment of bridge decks is growing and has the potential to reduce operating costs and extend lifecycles by fostering cost-effective and timely interventions. Highway agencies recognize that preservation treatments can impact the lifecycle costs of bridges. Several NDE technologies ide
...
Brown, M. C., ElBatanouny, M. K., Bektas, B., Azari, H., Foden, A., Imani, A., & Hawkins, K. (2024). Incorporating Nondestructive Evaluation Methods into Bridge Deck Preservation Strategies (Report No. FHWA-HRT-25-009). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology. https://doi.org/10.21949/1521524
Brown, Michael C, Mohamed K. ElBatanouny, Basak Bektas, Hoda Azari, Andrew Foden, Arezoo Imani, and Katherine Hawkins. Incorporating Nondestructive Evaluation Methods into Bridge Deck Preservation Strategies. Report no. FHWA-HRT-25-009. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024. https://doi.org/10.21949/1521524.
Brown, Michael C, et al. Incorporating Nondestructive Evaluation Methods into Bridge Deck Preservation Strategies. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024, Report no. FHWA-HRT-25-009, ROSA P. https://doi.org/10.21949/1521524.
This technote summarizes the research conducted to explore the capabilities and limitations of pocket lidar for curb ramp inspections. Specifically, the study focuses on the ability of the pocket lidar to extract slope measurements, which often poses difficulties in reliably obtaining this information.
Olsen, M., Che, E., Caya, J., Caya, M., Roe, G., Schneider, J., & Embacher, R. (2024). Pocket Lidar Curb Ramp Assessments [TechNote] (Report No. FHWA-HRT-25-014). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology. https://doi.org/10.21949/1521530
Olsen, Michael, Ezra Che, John Caya, Michael Caya, Gene Roe, James Schneider, and Rebecca Embacher. Pocket Lidar Curb Ramp Assessments [TechNote]. Report no. FHWA-HRT-25-014. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024. https://doi.org/10.21949/1521530.
Olsen, Michael, et al. Pocket Lidar Curb Ramp Assessments [TechNote]. United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2024, Report no. FHWA-HRT-25-014, ROSA P. https://doi.org/10.21949/1521530.
United States. Department of Transportation. Federal Highway Administration
2024-12-01
|
PDF
This flyer provides a summary of FHWA-HRT-25-035 and CR code to access the full report.
United States. Department of Transportation. Federal Highway Administration (2024). Exploring Risk Factors Contributing to Disparities in Pedestrian and Bicyclist Fatalities and Serious Injuries (Report No. FHWA-HRT-25-043). United States. Department of Transportation. Federal Highway Administration. https://doi.org/10.21949/1521425
United States. Department of Transportation. Federal Highway Administration. Exploring Risk Factors Contributing to Disparities in Pedestrian and Bicyclist Fatalities and Serious Injuries. Report no. FHWA-HRT-25-043. United States. Department of Transportation. Federal Highway Administration, 2024. https://doi.org/10.21949/1521425.
United States. Department of Transportation. Federal Highway Administration Exploring Risk Factors Contributing to Disparities in Pedestrian and Bicyclist Fatalities and Serious Injuries. United States. Department of Transportation. Federal Highway Administration, 2024, Report no. FHWA-HRT-25-043, ROSA P. https://doi.org/10.21949/1521425.
Links with this icon indicate that you are leaving a Bureau of Transportation
Statistics (BTS)/National Transportation Library (NTL)
Web-based service.
Thank you for visiting.
You are about to access a non-government link outside of
the U.S. Department of Transportation's National
Transportation Library.
Please note: While links to Web sites outside of DOT are
offered for your convenience, when you exit DOT Web sites,
Federal privacy policy and Section 508 of the Rehabilitation
Act (accessibility requirements) no longer apply. In
addition, DOT does not attest to the accuracy, relevance,
timeliness or completeness of information provided by linked
sites. Linking to a Web site does not constitute an
endorsement by DOT of the sponsors of the site or the
products presented on the site. For more information, please
view DOT's Web site linking policy.
To get back to the page you were previously viewing, click
your Cancel button.