Bonded concrete overlays rely on the underlying pavement to provide support and load carrying capacity. For bonded concrete overlays of asphalt pavement, the strength and thickness of the concrete slab and the bond between the new concrete surface and the existing asphalt essentially establishes a monolithic pavement structure. This case study summ
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Pierce, L. M., & Van Dam, T. (2023). Concrete Overlay: Colorado SH-13: Concrete on Asphalt-Bonded Case Study (Report No. FHWA-HIF-23-013). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/73579
Pierce, Linda M. and Tom Van Dam. Concrete Overlay: Colorado SH-13: Concrete on Asphalt-Bonded Case Study. Report no. FHWA-HIF-23-013. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/73579.
Pierce, Linda M., and Tom Van Dam Concrete Overlay: Colorado SH-13: Concrete on Asphalt-Bonded Case Study. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-HIF-23-013, ROSA P. https://rosap.ntl.bts.gov/view/dot/73579.
This reference manual (HEC-19) provides practical information in the evolving highway hydrology field. The information supports more resilient bridge and roadway design. Understanding of hydrologic behavior also can inform planning, design, operations, and maintenance. Following introductory material in Chapter 1 and policy context for hydrology in
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Kilgore, R., Atayee, A. T., Curtis, D., Harris, J., Herrmann, G. R., & Thompson, D. (2023). Highway Hydrology: Evolving Methods, Tools, and Data (Report No. FHWA-HIF-23-050). United States. Federal Highway Administration. Office of Bridges and Structures. https://rosap.ntl.bts.gov/view/dot/72770
Kilgore, Roger, A. Tamim Atayee, David Curtis, Jeff Harris, George R. Herrmann, and David Thompson. Highway Hydrology: Evolving Methods, Tools, and Data. Report no. FHWA-HIF-23-050. United States. Federal Highway Administration. Office of Bridges and Structures, 2023. https://rosap.ntl.bts.gov/view/dot/72770.
Kilgore, Roger, et al. Highway Hydrology: Evolving Methods, Tools, and Data. United States. Federal Highway Administration. Office of Bridges and Structures, 2023, Report no. FHWA-HIF-23-050, ROSA P. https://rosap.ntl.bts.gov/view/dot/72770.
This White Paper aims to increase understanding of the role agency culture and cultural change can play in mainstreaming transportation systems management and operations (TSMO) and help agencies identify ways to influence their agency’s culture to better facilitate mainstreaming TSMO. It presents concepts from fields such as change management, indu
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Robinson, E., Crowley, R., Bauer, J., Noyes, P., & Georgi, K. (2023). Role of Agency Culture in Mainstreaming TSMO (Report No. FHWA-HOP-21-043). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/67698
Robinson, Emanuel, Rachel Crowley, Jocelyn Bauer, Pat Noyes, and Kayce Georgi. Role of Agency Culture in Mainstreaming TSMO. Report no. FHWA-HOP-21-043. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/67698.
Robinson, Emanuel, et al. Role of Agency Culture in Mainstreaming TSMO. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-HOP-21-043, ROSA P. https://rosap.ntl.bts.gov/view/dot/67698.
2023-03-01
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FHWA Highway History Website Articles
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For, at a moment in time on April 19, 1929, "president" Harry S. Truman took part in the dedication of the monument as he had in the dedication of many of the 11 other Madonna of the Trail monuments in States the National Old Trails Road passed through.
Weingroff, R. F. (2023). A Moment in Time: "President" Harry S. Truman and the Madonna of the Trail. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/68584
Weingroff, Richard F.. A Moment in Time: "President" Harry S. Truman and the Madonna of the Trail. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/68584.
Weingroff, Richard F. A Moment in Time: "President" Harry S. Truman and the Madonna of the Trail. United States. Department of Transportation. Federal Highway Administration, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/68584.
United States. Department of Transportation. Federal Highway Administration. Office of Operations
2023-03-01
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This case study highlights practices in mainstreaming transportation systems management and operations (TSMO) at the Iowa Department of Transportation (DOT) and the Washington State Department of Transportation (WSDOT). Each agency has its own culture, and the approaches the two DOTs use illustrate mainstreaming in ways that are consistent with eac
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United States. Department of Transportation. Federal Highway Administration. Office of Operations (2023). Mainstreaming TSMO: Experiences From Iowa and Washington State (Report No. FHWA-HOP-23-018). United States. Department of Transportation. Federal Highway Administration. Office of Operations. https://rosap.ntl.bts.gov/view/dot/67685
United States. Department of Transportation. Federal Highway Administration. Office of Operations. Mainstreaming TSMO: Experiences From Iowa and Washington State. Report no. FHWA-HOP-23-018. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2023. https://rosap.ntl.bts.gov/view/dot/67685.
United States. Department of Transportation. Federal Highway Administration. Office of Operations Mainstreaming TSMO: Experiences From Iowa and Washington State. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2023, Report no. FHWA-HOP-23-018, ROSA P. https://rosap.ntl.bts.gov/view/dot/67685.
United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division
2023-03-01
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In 2022, the United States Forest Service (USFS) requested assistance from the Federal Highway Administration (FHWA) to conduct a multi-phase corridor study for Ashton-Flagg Ranch Road (AFRR). The condition of AFRR has been relatively stable for the past twenty years, despite ongoing deferred maintenance. However, increased visitation and changes i
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United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division (2023). Ashton-Flagg Ranch Road Corridor Study: Phase 1 – Existing Conditions Assessment. United States. Federal Highway Administration. Western Federal Lands Highway Division. https://rosap.ntl.bts.gov/view/dot/71906
United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division. Ashton-Flagg Ranch Road Corridor Study: Phase 1 – Existing Conditions Assessment. United States. Federal Highway Administration. Western Federal Lands Highway Division, 2023. https://rosap.ntl.bts.gov/view/dot/71906.
United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division Ashton-Flagg Ranch Road Corridor Study: Phase 1 – Existing Conditions Assessment. United States. Federal Highway Administration. Western Federal Lands Highway Division, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/71906.
United States. Department of Transportation. Federal Highway Administration. Office of Operations
2023-03-01
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At the Ohio Department of Transportation (ODOT), agency leadership and staff recognize that close coordination and joint activities between the highway safety program and the transportation systems management and operations (TSMO) program can improve safety and mobility outcomes. ODOT has long jointly considered safety and congestion and has found
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United States. Department of Transportation. Federal Highway Administration. Office of Operations (2023). Coordinating Operations and Safety Through Project Prioritization, Funding, and Design in Ohio (Report No. FHWA-HOP-22-083). United States. Department of Transportation. Federal Highway Administration. Office of Operations. https://rosap.ntl.bts.gov/view/dot/70446
United States. Department of Transportation. Federal Highway Administration. Office of Operations. Coordinating Operations and Safety Through Project Prioritization, Funding, and Design in Ohio. Report no. FHWA-HOP-22-083. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2023. https://rosap.ntl.bts.gov/view/dot/70446.
United States. Department of Transportation. Federal Highway Administration. Office of Operations Coordinating Operations and Safety Through Project Prioritization, Funding, and Design in Ohio. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2023, Report no. FHWA-HOP-22-083, ROSA P. https://rosap.ntl.bts.gov/view/dot/70446.
United States. Department of Transportation. Federal Highway Administration. Office of Operations
2023-03-01
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Transportation systems management and operations (TSMO) helps agencies maintain and even restore the operational performance of the existing transportation system quickly and cost effectively. Creating a culture that supports TSMO is vital to mainstreaming TSMO in an agency. Through mainstreaming, agencies ensure that leadership and key staff readi
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United States. Department of Transportation. Federal Highway Administration. Office of Operations (2023). Mainstreaming TSMO through Agency Culture (Report No. FHWA-HOP-23-014). United States. Department of Transportation. Federal Highway Administration. Office of Operations. https://rosap.ntl.bts.gov/view/dot/67704
United States. Department of Transportation. Federal Highway Administration. Office of Operations. Mainstreaming TSMO through Agency Culture. Report no. FHWA-HOP-23-014. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2023. https://rosap.ntl.bts.gov/view/dot/67704.
United States. Department of Transportation. Federal Highway Administration. Office of Operations Mainstreaming TSMO through Agency Culture. United States. Department of Transportation. Federal Highway Administration. Office of Operations, 2023, Report no. FHWA-HOP-23-014, ROSA P. https://rosap.ntl.bts.gov/view/dot/67704.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2023-03-01
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Traffic Volume Trends is a monthly report based on hourly traffic count data reported by the States. These data are collected at approximately 5,000 continuous traffic counting locations nationwide and are used to estimate the percent change in traffic for the current month compared with the same month in the previous year. Estimates are re-adjuste
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2023). Traffic Volume Trends: January 2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/67027
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Traffic Volume Trends: January 2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023. https://rosap.ntl.bts.gov/view/dot/67027.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Traffic Volume Trends: January 2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/67027.
Integrating Equity into Transportation: An Overview of USDOT Efforts; Integrating Equity into Transportation Funding and Project Prioritization; Integrating Equity into Transportation Planning; Incorporating an Equity-Based Approach into Transportation Operations; Meeting Transportation Goals with Equity.
Boutros, A., Field, S., Resler, K., Frost, M., Flom, E., & Cutting, S. (2023). Public Roads Vol. 87 No. 1 (Spring 2023). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology. https://rosap.ntl.bts.gov/view/dot/67994
Boutros, Anthony, Sharon Field, Kevin Resler, Mack Frost, Ewa Flom, and Shaun Cutting. Public Roads Vol. 87 No. 1 (Spring 2023). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2023. https://rosap.ntl.bts.gov/view/dot/67994.
Boutros, Anthony, et al. Public Roads Vol. 87 No. 1 (Spring 2023). United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/67994.
This summary report documents the results of an effort to develop a list of needs, objectives, and activities for enhancing safety in and around work zones nationally. The report aims to assist potential stakeholders in prioritizing work zone safety activities and implementing targeted work zone safety strategies. The report presents 11 specific st
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Ullman, G., Peach, K., Kersavage, K., Schroeder, J., & Serulle, N. U. (2023). Identification of National Work Zone Safety Objectives and Activities: Summary Report (Report No. FHWA-HOP-22-059). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/91964
Ullman, Gerald, Kara Peach, Kristin Kersavage, J. Schroeder, and Nayel Urena Serulle. Identification of National Work Zone Safety Objectives and Activities: Summary Report. Report no. FHWA-HOP-22-059. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/91964.
Ullman, Gerald, et al. Identification of National Work Zone Safety Objectives and Activities: Summary Report. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-HOP-22-059, ROSA P. https://rosap.ntl.bts.gov/view/dot/91964.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2023-02-26
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The Weekly Traffic Volume Report estimates the vehicle miles traveled (VMT) for interstate highways and how the total travel measured by VMT compares with travel that occurred in the same week of the previous year. The VMT is further split into passenger vehicle and truck components. The information gives new insights into the effect on traffic by
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2023). Special Monthly Reporting - Weekly Traffic Volume Data: Interstate Travel for Weeks 5, 6, 7, and 8, 1/30/2023-2/26/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/67285
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Special Monthly Reporting - Weekly Traffic Volume Data: Interstate Travel for Weeks 5, 6, 7, and 8, 1/30/2023-2/26/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023. https://rosap.ntl.bts.gov/view/dot/67285.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Special Monthly Reporting - Weekly Traffic Volume Data: Interstate Travel for Weeks 5, 6, 7, and 8, 1/30/2023-2/26/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/67285.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2023-02-24
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The Weekly Gasoline Product Supplied Report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Adminis
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2023). Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 21, Data Complete Through 2/24/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/66801
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 21, Data Complete Through 2/24/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023. https://rosap.ntl.bts.gov/view/dot/66801.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 21, Data Complete Through 2/24/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/66801.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2023-02-23
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On a monthly basis, each State is required to report to the Federal Highway Administration (FHWA), the amount of gallons taxed by that state. This data is analyzed and compiled by FHWA staff. The data on the amount of on-highway fuel use for each State is then used to attribute federal revenue to each State. Yearly, the FHWA, Office of Policy, prov
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2023). Monthly Motor Fuel Reported by States: September 2022 (Report No. FHWA-PL-23-003). United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/66838
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Monthly Motor Fuel Reported by States: September 2022. Report no. FHWA-PL-23-003. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023. https://rosap.ntl.bts.gov/view/dot/66838.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Monthly Motor Fuel Reported by States: September 2022. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023, Report no. FHWA-PL-23-003, ROSA P. https://rosap.ntl.bts.gov/view/dot/66838.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2023-02-17
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The Weekly Gasoline Product Supplied Report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Adminis
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2023). Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 20, Data Complete Through 2/17/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/66675
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 20, Data Complete Through 2/17/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023. https://rosap.ntl.bts.gov/view/dot/66675.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Special Issue - Weekly Motor Fuel Report: Gasoline Product Supplied for Fiscal Year Week No. 20, Data Complete Through 2/17/2023. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023, ROSA P. https://rosap.ntl.bts.gov/view/dot/66675.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2023-02-17
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On a monthly basis, each State is required to report to the Federal Highway Administration (FHWA), the amount of gallons taxed by that state. This data is analyzed and compiled by FHWA staff. The data on the amount of on-highway fuel use for each State is then used to attribute federal revenue to each State. Yearly, the FHWA, Office of Policy, prov
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information (2023). Monthly Motor Fuel Reported by States: August 2022 (Report No. FHWA-PL-23-02). United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/66547
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Monthly Motor Fuel Reported by States: August 2022. Report no. FHWA-PL-23-02. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023. https://rosap.ntl.bts.gov/view/dot/66547.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Monthly Motor Fuel Reported by States: August 2022. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2023, Report no. FHWA-PL-23-02, ROSA P. https://rosap.ntl.bts.gov/view/dot/66547.
United States. Department of Transportation. Federal Highway Administration
2023-02-17
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The first step to a safer roadway system is good data. The traditional approach to addressing traffic safety identifies safety issues after crashes occur. Using quality data to identify and mitigate contributing circumstances can reduce crash severity and help prevent future crashes. Quality data provides transportation professionals a means to mak
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United States. Department of Transportation. Federal Highway Administration (2023). The Highway Safety Improvement Program (HSIP) 2021: Using Data to Drive HSIP Investments (Report No. FHWA-SA-22-072). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/89929
United States. Department of Transportation. Federal Highway Administration. The Highway Safety Improvement Program (HSIP) 2021: Using Data to Drive HSIP Investments. Report no. FHWA-SA-22-072. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/89929.
United States. Department of Transportation. Federal Highway Administration The Highway Safety Improvement Program (HSIP) 2021: Using Data to Drive HSIP Investments. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-SA-22-072, ROSA P. https://rosap.ntl.bts.gov/view/dot/89929.
United States. Department of Transportation. Federal Highway Administration
2023-02-17
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Intersections, driveways, and access points are crucial connections to roadways. However, they also create conflict points where the potential for a crash between users increases. In 2020, more than a quarter (8,750) of all fatal crashes in the United States occurred at intersections. The HSIP can help support a Safe System and keep all road users
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United States. Department of Transportation. Federal Highway Administration (2023). The Highway Safety Improvement Program (HSIP) 2021: HSIP Calms Intersections (Report No. FHWA-SA-22-073). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/89930
United States. Department of Transportation. Federal Highway Administration. The Highway Safety Improvement Program (HSIP) 2021: HSIP Calms Intersections. Report no. FHWA-SA-22-073. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/89930.
United States. Department of Transportation. Federal Highway Administration The Highway Safety Improvement Program (HSIP) 2021: HSIP Calms Intersections. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-SA-22-073, ROSA P. https://rosap.ntl.bts.gov/view/dot/89930.
United States. Department of Transportation. Federal Highway Administration
2023-02-17
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In 2021, an estimated 42,915 people died in traffic crashes in the United States—a more than 10-percent increase from the previous year. To address road safety challenges, HSIP supported States with more than $3.3 billion in Federal funds in 2021. States used these funds to address safety challenges on all public roads, including non-State-owned ro
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United States. Department of Transportation. Federal Highway Administration (2023). The Highway Safety Improvement Program (HSIP) 2021: HSIP Saves Lives (Report No. FHWA-SA-22-070). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/89928
United States. Department of Transportation. Federal Highway Administration. The Highway Safety Improvement Program (HSIP) 2021: HSIP Saves Lives. Report no. FHWA-SA-22-070. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/89928.
United States. Department of Transportation. Federal Highway Administration The Highway Safety Improvement Program (HSIP) 2021: HSIP Saves Lives. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-SA-22-070, ROSA P. https://rosap.ntl.bts.gov/view/dot/89928.
United States. Department of Transportation. Federal Highway Administration
2023-02-17
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In 2020, 16,665 people died in crashes on rural roads, and although only an estimated 19 percent of the U.S. population lives in rural areas, 43 percent of fatal crashes occurred in rural areas that year. The HSIP funds projects that improve safety and prevent fatal and serious injury crashes on rural roads. People involved in crashes in rural area
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United States. Department of Transportation. Federal Highway Administration (2023). The Highway Safety Improvement Program (HSIP) 2021: HSIP Reaches Rural Roads (Report No. FHWA-SA-22-071). United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/89932
United States. Department of Transportation. Federal Highway Administration. The Highway Safety Improvement Program (HSIP) 2021: HSIP Reaches Rural Roads. Report no. FHWA-SA-22-071. United States. Department of Transportation. Federal Highway Administration, 2023. https://rosap.ntl.bts.gov/view/dot/89932.
United States. Department of Transportation. Federal Highway Administration The Highway Safety Improvement Program (HSIP) 2021: HSIP Reaches Rural Roads. United States. Department of Transportation. Federal Highway Administration, 2023, Report no. FHWA-SA-22-071, ROSA P. https://rosap.ntl.bts.gov/view/dot/89932.
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