Traffic engineers and researchers calibrate microsimulation models using macroscopic inputs—such as aggregated traffic throughput—instead of microscopic inputs, such as intervehicle spacing and acceleration. This has led to concerns that these models have been capturing the microscopic driver behaviors inaccurately, despite the macroscopic performa
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Hale, D. K., Li, X., Ghiasi, A., Zhao, D., Khalighi, F., Aycin, M., & James, R. M. (2021). Trajectory Investigation for Enhanced Calibration of Microsimulation Models (Report No. FHWA-HRT-21-071). United States. Federal Highway Administration. Office of Operations Research and Development. https://rosap.ntl.bts.gov/view/dot/57959
Hale, David K., Xiaopeng Li, Amir Ghiasi, Dongfang Zhao, Farnoush Khalighi, Murat Aycin, and Rachel M. James. Trajectory Investigation for Enhanced Calibration of Microsimulation Models. Report no. FHWA-HRT-21-071. United States. Federal Highway Administration. Office of Operations Research and Development, 2021. https://rosap.ntl.bts.gov/view/dot/57959.
Hale, David K., et al. Trajectory Investigation for Enhanced Calibration of Microsimulation Models. United States. Federal Highway Administration. Office of Operations Research and Development, 2021, Report no. FHWA-HRT-21-071, ROSA P. https://rosap.ntl.bts.gov/view/dot/57959.
This TechBrief provides the most recent research product in scour formation and offers an interim support for foundation design of bridges vulnerable to scour caused by tsunamis. This research supplements the product from the Transportation Pooled Fund study TPF5-(307), Validation of Tsunami Design Guidelines for Coastal Bridges, which developed an
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Suaznabar, O., Sinha, N., Sitek, M. A., Lottes, S., & Zhang, N. (2021). Pier Scour Estimation for Tsunami at Bridges [techbrief] (Report No. FHWA-HRT-21-073). United States. Federal Highway Administration. Office of Research, Development, and Technology. https://rosap.ntl.bts.gov/view/dot/57961
Suaznabar, Oscar, Nityanand Sinha, Marta A. Sitek, Steven Lottes, and Nasi Zhang. Pier Scour Estimation for Tsunami at Bridges [techbrief]. Report no. FHWA-HRT-21-073. United States. Federal Highway Administration. Office of Research, Development, and Technology, 2021. https://rosap.ntl.bts.gov/view/dot/57961.
Suaznabar, Oscar, et al. Pier Scour Estimation for Tsunami at Bridges [techbrief]. United States. Federal Highway Administration. Office of Research, Development, and Technology, 2021, Report no. FHWA-HRT-21-073, ROSA P. https://rosap.ntl.bts.gov/view/dot/57961.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2021-08-01
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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 (2021). Monthly Motor Fuel Reported by States: August 2021 (Report No. FHWA-PL-2022-005). United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/59812
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Monthly Motor Fuel Reported by States: August 2021. Report no. FHWA-PL-2022-005. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2021. https://rosap.ntl.bts.gov/view/dot/59812.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Monthly Motor Fuel Reported by States: August 2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2021, Report no. FHWA-PL-2022-005, ROSA P. https://rosap.ntl.bts.gov/view/dot/59812.
Life Cycle Planning (LCP) is “a process to estimate the cost of managing an asset class, or asset sub-group, over its whole life with consideration for minimizing cost while preserving or improving the condition (23 CFR Part 515).” Since LCP is a relatively new process for State DOTs, the Federal Highway Administration (FHWA) developed a handbook o
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Ram, P. V., Zimmerman, K. A., Borthakur, A., Mugabe, K., & Raghunathan, D. (2021). Demonstrating the Application of Life Cycle Planning (LCP) on a Pavement Network: Results from the Arizona DOT Pavement Pilot Project (Report No. FHWA-HIF-21-044). United States. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/62679
Ram, Prashant V, Kathryn A Zimmerman, Abhik Borthakur, Kundayi Mugabe, and Deepak Raghunathan. Demonstrating the Application of Life Cycle Planning (LCP) on a Pavement Network: Results from the Arizona DOT Pavement Pilot Project. Report no. FHWA-HIF-21-044. United States. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/62679.
Ram, Prashant V, et al. Demonstrating the Application of Life Cycle Planning (LCP) on a Pavement Network: Results from the Arizona DOT Pavement Pilot Project. United States. Federal Highway Administration, 2021, Report no. FHWA-HIF-21-044, ROSA P. https://rosap.ntl.bts.gov/view/dot/62679.
United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure
2021-08-01
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This tech brief gives an overview of potential benefits and challenges of applying subsurface utility engineering (SUE) to highway construction projects, with a focus on SUE in Delaware.
United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure (2021). Subsurface Utility Engineering Saves Time and Costs in Delaware [tech brief] (Report No. FHWA-HIF-22-002). United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure. https://rosap.ntl.bts.gov/view/dot/60342
United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure. Subsurface Utility Engineering Saves Time and Costs in Delaware [tech brief]. Report no. FHWA-HIF-22-002. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure, 2021. https://rosap.ntl.bts.gov/view/dot/60342.
United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Subsurface Utility Engineering Saves Time and Costs in Delaware [tech brief]. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure, 2021, Report no. FHWA-HIF-22-002, ROSA P. https://rosap.ntl.bts.gov/view/dot/60342.
Waste plastic, though largely considered an environmental concern, has the potential to be a valuable resource. Some researchers have proposed mixing waste plastic with asphalt binder to make asphalt for the Nation’s roadways. Use of waste plastics to supplement traditional asphalt binders can reduce resource consumption and become an alternative t
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Exploratory Advanced Research Program (U.S.) (2021). Improving the Compatibility of Waste [fact sheet] (Report No. FHWA-HRT-21-084). United States. Federal Highway Administration. Exploratory Advanced Research Program. https://doi.org/10.21949/1521670
Exploratory Advanced Research Program (U.S.). Improving the Compatibility of Waste [fact sheet]. Report no. FHWA-HRT-21-084. United States. Federal Highway Administration. Exploratory Advanced Research Program, 2021. https://doi.org/10.21949/1521670.
Exploratory Advanced Research Program (U.S.) Improving the Compatibility of Waste [fact sheet]. United States. Federal Highway Administration. Exploratory Advanced Research Program, 2021, Report no. FHWA-HRT-21-084, ROSA P. https://doi.org/10.21949/1521670.
United States. Department of Transportation. Federal Highway Administration
2021-08-01
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Successes in Stewardship Newsletter
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Successes in Stewardship is a Federal Highway Administration (FHWA) bimonthly newsletter highlighting current best practices in stewardship and environmental review from around the country.
United States. Department of Transportation. Federal Highway Administration (2021). Successes in Stewardship - 2018-2020 in Review: Key Takeaways for Accelerating Project Delivery and Improving Environmental Outcomes. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/74423
United States. Department of Transportation. Federal Highway Administration. Successes in Stewardship - 2018-2020 in Review: Key Takeaways for Accelerating Project Delivery and Improving Environmental Outcomes. United States. Department of Transportation. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/74423.
United States. Department of Transportation. Federal Highway Administration Successes in Stewardship - 2018-2020 in Review: Key Takeaways for Accelerating Project Delivery and Improving Environmental Outcomes. United States. Department of Transportation. Federal Highway Administration, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/74423.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2021-08-01
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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 (2021). Special Issue - Weekly Traffic Volume Report: Interstate Travel for Week No. 30, 7/26/2021 - 8/1/2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/57257
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Special Issue - Weekly Traffic Volume Report: Interstate Travel for Week No. 30, 7/26/2021 - 8/1/2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2021. https://rosap.ntl.bts.gov/view/dot/57257.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Special Issue - Weekly Traffic Volume Report: Interstate Travel for Week No. 30, 7/26/2021 - 8/1/2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/57257.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2021-08-01
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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 (2021). Traffic Volume Trends: August 2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. https://rosap.ntl.bts.gov/view/dot/58305
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information. Traffic Volume Trends: August 2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2021. https://rosap.ntl.bts.gov/view/dot/58305.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information Traffic Volume Trends: August 2021. United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/58305.
This report assesses the effects of the Federal Highway Administration's (FHWA's) investment in the Innovative Intersection Design research program and related activities on the availability and quality of such research; awareness and adoption of innovative intersection designs in the United States; and impact of deployed innovative intersection de
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Badgley, J., Fowler, J., Mahavier, K., & Peirce, S. (2021). FHWA Research and Technology Evaluation: Innovative Intersection Design (Report No. FHWA-HRT-21-024). United States. Federal Highway Administration. Office of Corporate Research, Technology, and Innovation Management. https://rosap.ntl.bts.gov/view/dot/56950
Badgley, Jonathan, Joshua Fowler, Kendall Mahavier, and Sean Peirce. FHWA Research and Technology Evaluation: Innovative Intersection Design. Report no. FHWA-HRT-21-024. United States. Federal Highway Administration. Office of Corporate Research, Technology, and Innovation Management, 2021. https://rosap.ntl.bts.gov/view/dot/56950.
Badgley, Jonathan, et al. FHWA Research and Technology Evaluation: Innovative Intersection Design. United States. Federal Highway Administration. Office of Corporate Research, Technology, and Innovation Management, 2021, Report no. FHWA-HRT-21-024, ROSA P. https://rosap.ntl.bts.gov/view/dot/56950.
Through this project, researchers evaluated the safety effects of guardrails, utility poles, and side slopes using safety data from Indiana and Pennsylvania. Safety evaluations in this project focused on total, fatal-and-injury, and roadway-departure crash risk. Crash modification factors (CMFs) and benefit–cost (B/C) ratios were developed for the
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Avelar, R., Dixon, K., Ashraf, S., & Jhamb, A. (2021). Developing Crash Modification Factors for Guardrails, Utility Poles, and Side-Slope Improvements (Report No. FHWA-HRT-21-075). United States. Federal Highway Administration. Office of Safety Research and Development. https://rosap.ntl.bts.gov/view/dot/57955
Avelar, Raul, Karen Dixon, Sruthi Ashraf, and Ankit Jhamb. Developing Crash Modification Factors for Guardrails, Utility Poles, and Side-Slope Improvements. Report no. FHWA-HRT-21-075. United States. Federal Highway Administration. Office of Safety Research and Development, 2021. https://rosap.ntl.bts.gov/view/dot/57955.
Avelar, Raul, et al. Developing Crash Modification Factors for Guardrails, Utility Poles, and Side-Slope Improvements. United States. Federal Highway Administration. Office of Safety Research and Development, 2021, Report no. FHWA-HRT-21-075, ROSA P. https://rosap.ntl.bts.gov/view/dot/57955.
United States. Federal Highway Administration. Center for Accelerating Innovation
2021-08-01
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Innovator, published by the FHWA Center for Accelerating Innovation, advances implementation of innovative technologies and processes in the highway industry. Its audience is transportation professionals in highway agencies, trade and research groups, academia and the private sector, and the driving public.
United States. Federal Highway Administration. Center for Accelerating Innovation (2021). Innovator - July/August 2021 - Volume 15, Issue 85 (Report No. FHWA-21-CAI-021). United States. Federal Highway Administration. Center for Accelerating Innovation. https://rosap.ntl.bts.gov/view/dot/57059
United States. Federal Highway Administration. Center for Accelerating Innovation. Innovator - July/August 2021 - Volume 15, Issue 85. Report no. FHWA-21-CAI-021. United States. Federal Highway Administration. Center for Accelerating Innovation, 2021. https://rosap.ntl.bts.gov/view/dot/57059.
United States. Federal Highway Administration. Center for Accelerating Innovation Innovator - July/August 2021 - Volume 15, Issue 85. United States. Federal Highway Administration. Center for Accelerating Innovation, 2021, Report no. FHWA-21-CAI-021, ROSA P. https://rosap.ntl.bts.gov/view/dot/57059.
2021-08-01
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FHWA Highway History Website Articles
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This article is about the history and legislation that lead to the construction of Cumberland Road also known as National Road.
Weingroff, R. F. (2021). The Nation's First Mega-Project: A Legislative History of the Cumberland Road. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/68561
Weingroff, Richard F.. The Nation's First Mega-Project: A Legislative History of the Cumberland Road. United States. Department of Transportation. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/68561.
Weingroff, Richard F. The Nation's First Mega-Project: A Legislative History of the Cumberland Road. United States. Department of Transportation. Federal Highway Administration, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/68561.
Experiments on stationary sectional models of scaled replica of bridge stay cables were carried out in a 2-by 3-m wind tunnel. The cross-sectional shapes of the cable models were obtained from direct measurements of stay cables for bridges in service. The purpose of the experiments was to establish a relationship between the level of eccentricity a
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Christiansen, H., & Larose, G. L. (2021). Wind-Tunnel Investigations of the Aerodynamics of Bridge Stay Cable Cross-Sectional Shapes (Report No. FHWA-HRT-21-074). United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development. https://rosap.ntl.bts.gov/view/dot/57316
Christiansen, Heidi and Guy L. Larose. Wind-Tunnel Investigations of the Aerodynamics of Bridge Stay Cable Cross-Sectional Shapes. Report no. FHWA-HRT-21-074. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development, 2021. https://rosap.ntl.bts.gov/view/dot/57316.
Christiansen, Heidi, and Guy L. Larose Wind-Tunnel Investigations of the Aerodynamics of Bridge Stay Cable Cross-Sectional Shapes. United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure Research and Development, 2021, Report no. FHWA-HRT-21-074, ROSA P. https://rosap.ntl.bts.gov/view/dot/57316.
Concrete on concrete–unbonded (COC–U) overlays leverage the investment already made in the existing pavement structure while eliminating the need for extensive preservation activities. This case study summarizes the design, construction, and performance of a COC–U overlay of an existing jointed concrete pavement.
Tayabji, S. D. (2021). Concrete Overlay: Alabama I-59: Concrete on Concrete–Unbonded [case study] (Report No. FHWA-HIF-21-045). United States. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/62667
Tayabji, Shiraz D.. Concrete Overlay: Alabama I-59: Concrete on Concrete–Unbonded [case study]. Report no. FHWA-HIF-21-045. United States. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/62667.
Tayabji, Shiraz D. Concrete Overlay: Alabama I-59: Concrete on Concrete–Unbonded [case study]. United States. Federal Highway Administration, 2021, Report no. FHWA-HIF-21-045, ROSA P. https://rosap.ntl.bts.gov/view/dot/62667.
2021-08-01
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FHWA Highway History Website Articles
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This is the introduction of a cross-country trip made by John W. Cross' family from New Jersey to National Parks in the West coast.
Cross, J. W. (2021). Driving Out West in 1940: Introduction. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/68554
Cross, John W.. Driving Out West in 1940: Introduction. United States. Department of Transportation. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/68554.
Cross, John W. Driving Out West in 1940: Introduction. United States. Department of Transportation. Federal Highway Administration, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/68554.
2021-08-01
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FHWA Highway History Website Articles
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Bibliography of U.S. Route 66
Weingroff, R. F. (2021). Highway History Bibliography: U.S. Route 66. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/68568
Weingroff, Richard F.. Highway History Bibliography: U.S. Route 66. United States. Department of Transportation. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/68568.
Weingroff, Richard F. Highway History Bibliography: U.S. Route 66. United States. Department of Transportation. Federal Highway Administration, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/68568.
2021-08-01
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FHWA Highway History Website Articles
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Transcription of the diary of Margaret Helene Goodman of her road trip from New Jersey to National Parks in the west coast of the U.S.
Cross, J. W. (2021). Driving Out West in 1940: Diary of Margaret Helene Goodman. United States. Department of Transportation. Federal Highway Administration. https://rosap.ntl.bts.gov/view/dot/68557
Cross, John W.. Driving Out West in 1940: Diary of Margaret Helene Goodman. United States. Department of Transportation. Federal Highway Administration, 2021. https://rosap.ntl.bts.gov/view/dot/68557.
Cross, John W. Driving Out West in 1940: Diary of Margaret Helene Goodman. United States. Department of Transportation. Federal Highway Administration, 2021, ROSA P. https://rosap.ntl.bts.gov/view/dot/68557.
This evaluation assesses how the Federal Highway Administration's (FHWA's) investment in research on high friction surface treatments (HFSTs) and related activities impact the availability and quality of such research; awareness, knowledge, and attitudes toward HFSTs in the United States; adoption of HFSTs as a safety measure; and safety performanc
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Coppinger, K., Keen, M., Gissel, J., & Rainville, L. (2021). FHWA Research and Technology Evaluation: High Friction Surface Treatments (Report No. FHWA-HRT-21-014). United States. Federal Highway Administration. Office of Corporate Research, Technology, and Innovation Management. https://rosap.ntl.bts.gov/view/dot/57317
Coppinger, Kaitlin, Matthew Keen, Jennifer Gissel, and Lydia Rainville. FHWA Research and Technology Evaluation: High Friction Surface Treatments. Report no. FHWA-HRT-21-014. United States. Federal Highway Administration. Office of Corporate Research, Technology, and Innovation Management, 2021. https://rosap.ntl.bts.gov/view/dot/57317.
Coppinger, Kaitlin, et al. FHWA Research and Technology Evaluation: High Friction Surface Treatments. United States. Federal Highway Administration. Office of Corporate Research, Technology, and Innovation Management, 2021, Report no. FHWA-HRT-21-014, ROSA P. https://rosap.ntl.bts.gov/view/dot/57317.
United States. Federal Highway Administration. Office of Bridge Technology
2021-08-01
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This Technical Brief provides an overview of “Advancing Steel and Concrete Bridge Technology to Improve Infrastructure Performance Program.” The objective was to research design details of Electrically Isolated Tendon (EIT) technology for post-tensioning systems in concrete bridges to accommodate epoxy-coated mild steel reinforcement and permit pos
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United States. Federal Highway Administration. Office of Bridge Technology (2021). Development of Reference Criteria for Electrically Isolated Post-Tensioning Tendons in U.S. Bridge Applications [tech brief] (Report No. FHWA-HIF-20-042). United States. Federal Highway Administration. Office of Bridge Technology. https://rosap.ntl.bts.gov/view/dot/62736
United States. Federal Highway Administration. Office of Bridge Technology. Development of Reference Criteria for Electrically Isolated Post-Tensioning Tendons in U.S. Bridge Applications [tech brief]. Report no. FHWA-HIF-20-042. United States. Federal Highway Administration. Office of Bridge Technology, 2021. https://rosap.ntl.bts.gov/view/dot/62736.
United States. Federal Highway Administration. Office of Bridge Technology Development of Reference Criteria for Electrically Isolated Post-Tensioning Tendons in U.S. Bridge Applications [tech brief]. United States. Federal Highway Administration. Office of Bridge Technology, 2021, Report no. FHWA-HIF-20-042, ROSA P. https://rosap.ntl.bts.gov/view/dot/62736.
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