The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Supplemental cementitious materials (SCMs), such as fly ash, slag, silica fume, and metakaolin have become commonplace in Florida concrete, particularly for high durability or high-strength concrete. The Florida Department of Transportation (FDOT) currently allows fly ash to be used as a cement replacement at 18-50% levels and slag cement to be sub
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Riding, K. A. (2024). Durability of Concrete Using Low Slag Cement Contents [Brief]. Florida. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78833
Riding, Kyle A. Durability of Concrete Using Low Slag Cement Contents [Brief]. Florida. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78833.
Riding, Kyle A Durability of Concrete Using Low Slag Cement Contents [Brief]. Florida. Department of Transportation, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/78833.
Traditionally, MoDOT performed bridge load ratings using the Load Factor Rating (LFR) methodology. With the adoption of Load and Resistance Factor Design based Load and Resistance Factor Rating (LRFR) methodology, MoDOT is migrating to LRFR for rating bridges. The primary goal of this study is to develop and recommend load posting policies using th
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Supporting Files
Ganesh, T., Finke, J., Myers, J., Tran, B., Cheruiyot, R., & Khanal, N. (2024). Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges (Report No. cmr24-021). Missouri. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78582
Ganesh, Thiagarajan, John Finke, John Myers, Bao Tran, Ronald Cheruiyot, and Nirav Khanal. Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges. Report no. cmr24-021. Missouri. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78582.
Ganesh, Thiagarajan, et al. Load and Resistance Factor Rating Methodology Recommendations for Missouri Bridges. Missouri. Department of Transportation, 2024, Report no. cmr24-021, ROSA P. https://rosap.ntl.bts.gov/view/dot/78582.
The major objective of this study was to develop scientifically based recommendations for acceptable California Bearing Ratio (CBR) values for Kansas subgrades. To this end, multiple statistical analyses including: 1) Principal Component Regression Analysis (PCRA), 2) Regression Analysis (RA), 3) Multivariate Principal Component Regression Analysis
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Perić, D., Goh, G., & Olia, A. S. R. (2024). Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data (Report No. K-TRAN: KSU-18-3). Kansas State University. Transportation Center. https://rosap.ntl.bts.gov/view/dot/78811
Perić, Dunja, Gyuhyeong Goh, and Arash Saeidi Rashk Olia. Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data. Report no. K-TRAN: KSU-18-3. Kansas State University. Transportation Center, 2024. https://rosap.ntl.bts.gov/view/dot/78811.
Perić, Dunja, et al. Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data. Kansas State University. Transportation Center, 2024, Report no. K-TRAN: KSU-18-3, ROSA P. https://rosap.ntl.bts.gov/view/dot/78811.
The ability to accurately detect sulfates in an existing subgrade has been a major challenge for INDOT’s pavement maintenance and rehabilitation projects. Although naturally occurring sulfates in soil pose a significant construction challenge, detecting sulfates in an existing subgrade may be problematic and costly, given that the presence of sulfa
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Gupta, K., Santagata, �., & Bobet, A. (2024). Detection and Assessment of Sulfates in the Pavement Subgrade (Report No. FHWA/IN/JTRP-2024/34). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284317808
Gupta, Kanika, Maria C. Santagata, and Antonio Bobet. Detection and Assessment of Sulfates in the Pavement Subgrade. Report no. FHWA/IN/JTRP-2024/34. Purdue University. Joint Transportation Research Program, 2024. https://doi.org/10.5703/1288284317808.
Gupta, Kanika, et al. Detection and Assessment of Sulfates in the Pavement Subgrade. Purdue University. Joint Transportation Research Program, 2024, Report no. FHWA/IN/JTRP-2024/34, ROSA P. https://doi.org/10.5703/1288284317808.
The spacing of access points is one of the most critical elements in access management. This project aims to investigate the effect of access spacing on crash risk using scientifically rigorous statistical methods and to examine VDOT’s current access spacing standards. Specifically, the study focuses on unsignalized access types located on principa
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Xie, K., Yang, H., & Dong, X. (2024). Reconsidering the Impact of Access Spacing on Crash Risk (Report No. FHWA/VTRC 25-R8). Virginia. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78948
Xie, Kun, Hong Yang, and Xiaomeng Dong. Reconsidering the Impact of Access Spacing on Crash Risk. Report no. FHWA/VTRC 25-R8. Virginia. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78948.
Xie, Kun, et al. Reconsidering the Impact of Access Spacing on Crash Risk. Virginia. Department of Transportation, 2024, Report no. FHWA/VTRC 25-R8, ROSA P. https://rosap.ntl.bts.gov/view/dot/78948.
Automating the estimation of winter road surface conditions has the potential to improve the speed, efficiency, and cost-effectiveness of winter road maintenance activities.
Kwon, T. J. (2024). Optimal RWIS Sensor Density and Location – Phase IV [Tech Transfer Summary]. Iowa. Department of Transportation. Aurora Program. https://rosap.ntl.bts.gov/view/dot/82854
Kwon, Tae J. Optimal RWIS Sensor Density and Location – Phase IV [Tech Transfer Summary]. Iowa. Department of Transportation. Aurora Program, 2024. https://rosap.ntl.bts.gov/view/dot/82854.
Kwon, Tae J Optimal RWIS Sensor Density and Location – Phase IV [Tech Transfer Summary]. Iowa. Department of Transportation. Aurora Program, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/82854.
California Bearing Ratio (CBR) of subgrade soils, which can be used in design of flexible pavements, can be obtained from Dynamic Cone Penetrometer (DCP) tests through a statistical correlation. The main objective of this study was to determine an acceptable CBR value based on the use of statistical pavement performance evaluation models. To this e
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Perić, D., Goh, G., & Olia, A. S. R. (2024). Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data [Technical Summary] (Report No. K-TRAN: KSU-18-3). Kansas State University. Transportation Center. https://rosap.ntl.bts.gov/view/dot/78824
Perić, Dunja, Gyuhyeong Goh, and Arash Saeidi Rashk Olia. Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data [Technical Summary]. Report no. K-TRAN: KSU-18-3. Kansas State University. Transportation Center, 2024. https://rosap.ntl.bts.gov/view/dot/78824.
Perić, Dunja, et al. Determining an Acceptable California Bearing Ratio (CBR) Value for Kansas Subgrades Based on Pavement Distress Data [Technical Summary]. Kansas State University. Transportation Center, 2024, Report no. K-TRAN: KSU-18-3, ROSA P. https://rosap.ntl.bts.gov/view/dot/78824.
A potential vulnerability of a tower drive vertical lift bridge is a failure to maintain level operation over the length or width of its movable span; this is known as longitudinal or transverse skew, respectively. When either of these conditions occurs, they can cause the movable span to jam in its guides; without adequate protection, this can lea
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Rees, G. (2024). Skew Detection System Replacement on Vertical Lift Bridges (Phase 2) [Technical Summary] (Report No. LTRC Report 703). Louisiana. Department of Transportation and Development. https://rosap.ntl.bts.gov/view/dot/78684
Rees, Gareth. Skew Detection System Replacement on Vertical Lift Bridges (Phase 2) [Technical Summary]. Report no. LTRC Report 703. Louisiana. Department of Transportation and Development, 2024. https://rosap.ntl.bts.gov/view/dot/78684.
Rees, Gareth Skew Detection System Replacement on Vertical Lift Bridges (Phase 2) [Technical Summary]. Louisiana. Department of Transportation and Development, 2024, Report no. LTRC Report 703, ROSA P. https://rosap.ntl.bts.gov/view/dot/78684.
The Bear Tracks Automated Shuttle Pilot was a research project that included the 12-month operation (August 2022-July 2023) of a Level 3 Automated Vehicle (AV) Shuttle along a 1.5-mile-long route in the city of White Bear Lake. The shuttle itself was a self-driving, electric, multi-passenger vehicle that drove at a speed between 10-12 miles per hou
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Minnesota. Department of Transportation, AECOM, Newtrax, Navya, & City of White Bear Lake (2024). Project Summary: White Bear Lake Automated Shuttle Pilot: Bear Tracks. Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/82266
Minnesota. Department of Transportation, AECOM, Newtrax, Navya, and City of White Bear Lake. Project Summary: White Bear Lake Automated Shuttle Pilot: Bear Tracks. Minnesota. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/82266.
Minnesota. Department of Transportation, et al. Project Summary: White Bear Lake Automated Shuttle Pilot: Bear Tracks. Minnesota. Department of Transportation, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/82266.
This research addresses the application of precast columns in Texas bridge construction. The project combines experimental and analytical methods to develop innovative design concepts and construction details for precast concrete columns. Key design concept includes a spun-cast precast shell filled with a cast-in-place (CIP) core and connecting rei
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Montero-Carvajal, E., Kotha, C., Small, L., Zilveti, L., Park, C., Jang, H., Saqan, E., Webb, Z., Wang, H. C., Murcia-Delso, J., & Bayrak, O. (2024). Develop and Validate Precast Column Solutions for Texas Bridges (Report No. FHWA/TX-25/0-7089-1). University of Texas at Austin. Center for Transportation Research. https://rosap.ntl.bts.gov/view/dot/78761
Montero-Carvajal, Emmanuel, Chakravarthi Kotha, Luke Small, Lucas Zilveti, Chunsuk Park, Hansol Jang, and Elias Saqan, et al.. Develop and Validate Precast Column Solutions for Texas Bridges. Report no. FHWA/TX-25/0-7089-1. University of Texas at Austin. Center for Transportation Research, 2024. https://rosap.ntl.bts.gov/view/dot/78761.
Montero-Carvajal, Emmanuel, et al. Develop and Validate Precast Column Solutions for Texas Bridges. University of Texas at Austin. Center for Transportation Research, 2024, Report no. FHWA/TX-25/0-7089-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/78761.
The Variable Pedestrian Clearance Interval (VPCI) project consisted of deploying, testing, and analyzing the results of installing video at an intersection to extend the Flashing Don't Walk (FDW) interval as needed when pedestrians were still located within the crosswalk.
Minnesota. Department of Transportation (2024). Project Summary: Variable Pedestrian Clearance Interval (VPCI). Minnesota. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/82268
Minnesota. Department of Transportation. Project Summary: Variable Pedestrian Clearance Interval (VPCI). Minnesota. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/82268.
Minnesota. Department of Transportation Project Summary: Variable Pedestrian Clearance Interval (VPCI). Minnesota. Department of Transportation, 2024, ROSA P. https://rosap.ntl.bts.gov/view/dot/82268.
Reducing the number of through travel lanes requires drivers to decide where and when they will merge from the lane that is being dropped (the short lane) to the adjacent through lane. When a large proportion of drivers choose to merge significantly upstream, this can result in poor lane utilization at an upstream signal which, in turn, leads to un
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Anderson, C., Runyan, S. L., Bassett, D., Brimley, B., & Burbidge, S. K. (2024). Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops [2024] (Report No. UT-24.19). Utah Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78718
Anderson, Camille, Samuel L Runyan, David Bassett, Brad Brimley, and Shaunna K. Burbidge. Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops [2024]. Report no. UT-24.19. Utah Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78718.
Anderson, Camille, et al. Predicting Lane Utilization at Signalized Intersections in Advance of Arterial Lane Drops [2024]. Utah Department of Transportation, 2024, Report no. UT-24.19, ROSA P. https://rosap.ntl.bts.gov/view/dot/78718.
Traffic data are essential for decision-making by state departments of transportation in planning, designing, operating, maintaining, and rehabilitating transportation systems. However, collecting traffic counts at numerous portable sites in rural areas demands significant time and resources. In response, the Georgia Department of Transportation (G
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Yang, J. J., Wang, L., Durham, S. A., Birgisson, B., Han, J., Zhen, H., Huang, Y., Lares, O., & Bonam, I. (2024). Leveraging Probe Data for Improving Incident Management Practice in Rural Areas (Report No. FHWA-GA-24-2325). Georgia. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78988
Yang, Jidong J, Linbing Wang, Stephan A. Durham, Bjorn Birgisson, Jintong Han, Hao Zhen, Yongcan Huang, Oscar Lares, and Ian Bonam. Leveraging Probe Data for Improving Incident Management Practice in Rural Areas. Report no. FHWA-GA-24-2325. Georgia. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78988.
Yang, Jidong J, et al. Leveraging Probe Data for Improving Incident Management Practice in Rural Areas. Georgia. Department of Transportation, 2024, Report no. FHWA-GA-24-2325, ROSA P. https://rosap.ntl.bts.gov/view/dot/78988.
This study focused on improving light weight deflectometer (LWD) testing protocols and understanding material and equipment variability. The Indiana Department of Transportation (INDOT) adopted the LWD test for its efficiency and effectiveness in measuring soil stiffness, a crucial parameter for pavement structural layers. However, challenges remai
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Tiwari, N., Shin, B., Becker, P. J., & Bobet, A. (2024). Improved Light Weight Deflectometer Test (LWD) and Analysis (Report No. FHWA/IN/JTRP- 2024/35). Purdue University. Joint Transportation Research Program. https://doi.org/10.5703/1288284317813
Tiwari, Nitin, Boonam Shin, Peter J. Becker, and Antonio Bobet. Improved Light Weight Deflectometer Test (LWD) and Analysis. Report no. FHWA/IN/JTRP- 2024/35. Purdue University. Joint Transportation Research Program, 2024. https://doi.org/10.5703/1288284317813.
Tiwari, Nitin, et al. Improved Light Weight Deflectometer Test (LWD) and Analysis. Purdue University. Joint Transportation Research Program, 2024, Report no. FHWA/IN/JTRP- 2024/35, ROSA P. https://doi.org/10.5703/1288284317813.
This work involved providing support to the Lufkin, Odessa, and Brownwood Districts during their 2024 seal coat season for determining the tire rubber content using portable XRF units. CTR staff travelled to the three districts to conduct training refreshers and assist in analyzing field samples used in district seal coats. Analysis was performed o
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Bhasin, A., Hazlett, D., & Filonzi, A. (2024). Support XRF Determination of Tire Rubber Content in Asphalt Binders (Report No. FHWA/TX-25/0-7168-01-1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/78936
Bhasin, Amit, Darren Hazlett, and Angelo Filonzi. Support XRF Determination of Tire Rubber Content in Asphalt Binders. Report no. FHWA/TX-25/0-7168-01-1. Texas Department of Transportation. Research and Technology Implementation Office, 2024. https://rosap.ntl.bts.gov/view/dot/78936.
Bhasin, Amit, et al. Support XRF Determination of Tire Rubber Content in Asphalt Binders. Texas Department of Transportation. Research and Technology Implementation Office, 2024, Report no. FHWA/TX-25/0-7168-01-1, ROSA P. https://rosap.ntl.bts.gov/view/dot/78936.
When speed limits are set via an engineering speed zone study, the operating speed for a site is needed. This research project investigated whether probe speed data (rather than speeds measured in the field) could reasonably be used in a speed zone study. The idea for using probe speed data is to develop conversion equations that would convert an a
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Fitzpatrick, K., Kutela, B., Park, E. S., Pratt, M. P., Venglar, S. P., & Le, M. (2024). Using Vehicle Probe Data to Evaluate Speed Limits (Report No. FHWA/TX-24/0-7156-R1). Texas. Department of Transportation. https://rosap.ntl.bts.gov/view/dot/78979
Fitzpatrick, Kay, Boniphace Kutela, Eun Sug Park, Michael P. Pratt, Steven P. Venglar, and Minh Le. Using Vehicle Probe Data to Evaluate Speed Limits. Report no. FHWA/TX-24/0-7156-R1. Texas. Department of Transportation, 2024. https://rosap.ntl.bts.gov/view/dot/78979.
Fitzpatrick, Kay, et al. Using Vehicle Probe Data to Evaluate Speed Limits. Texas. Department of Transportation, 2024, Report no. FHWA/TX-24/0-7156-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/78979.
The Texas Department of Transportation (TxDOT) is strategically leveraging unmanned aircraft systems (UASs) to advance various initiatives, including land surveying. TxDOT is focused on assessing and documenting the benefits and limitations of UAS survey technology, with a particular emphasis on data quality, repeatability, and overall task suitabi
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Starek, M. J., Berryhill, J., Pashaei, M., Congo, J., Chu, T., Shukla, H., & Quiroga, C. (2024). Unmanned Aircraft Systems in Land Surveying: A Comparative Study of Lidar and Photogrammetry (Report No. FHWA/TX-25/0-7157-R1). Texas Department of Transportation. Research and Technology Implementation Office. https://rosap.ntl.bts.gov/view/dot/79334
Starek, Michael J., Jacob Berryhill, Mohammad Pashaei, Jose Congo, Tianxing Chu, Harshit Shukla, and Cesar Quiroga. Unmanned Aircraft Systems in Land Surveying: A Comparative Study of Lidar and Photogrammetry. Report no. FHWA/TX-25/0-7157-R1. Texas Department of Transportation. Research and Technology Implementation Office, 2024. https://rosap.ntl.bts.gov/view/dot/79334.
Starek, Michael J., et al. Unmanned Aircraft Systems in Land Surveying: A Comparative Study of Lidar and Photogrammetry. Texas Department of Transportation. Research and Technology Implementation Office, 2024, Report no. FHWA/TX-25/0-7157-R1, ROSA P. https://rosap.ntl.bts.gov/view/dot/79334.
Airports generate economic impacts that are felt well beyond their physical boundaries by supporting commerce, tourism, and the provision of essential services. To understand the economic contributions of airports throughout Kentucky, researchers collected data from general aviation (GA) airports and commercial service (CS) airports across the stat
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Marks, P. G., Paris, B., & Gibson, B. (2024). Economic Contribution of Kentucky Airports (Report No. KTC-25-12). University of Kentucky Transportation Center. https://rosap.ntl.bts.gov/view/dot/87434
Marks, P. Gayle, Bethany Paris, and Bryan Gibson. Economic Contribution of Kentucky Airports. Report no. KTC-25-12. University of Kentucky Transportation Center, 2024. https://rosap.ntl.bts.gov/view/dot/87434.
Marks, P. Gayle, et al. Economic Contribution of Kentucky Airports. University of Kentucky Transportation Center, 2024, Report no. KTC-25-12, ROSA P. https://rosap.ntl.bts.gov/view/dot/87434.
Pavement friction, as measured by metrics such as the skid number (SN), may be linked to traffic safety outcomes. To examine this hypothesis, this cross-sectional study collected data from an interstate highway (I-15) and a non-interstate highway (US-89) within the state of Utah, covering the years 2016 to 2019. For each segment, data included traf
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Acharya, S., Subedi, A., Singleton, P. A., & Mekker, M. (2024). Validating the Collection of Skid Data by Assessing Correlation With Crash Data (Report No. UT-24.13). Utah. Dept. of Transportation. Division of Research. https://rosap.ntl.bts.gov/view/dot/78710
Acharya, Sailesh, Atul Subedi, Patrick A. Singleton, and Michelle Mekker. Validating the Collection of Skid Data by Assessing Correlation With Crash Data. Report no. UT-24.13. Utah. Dept. of Transportation. Division of Research, 2024. https://rosap.ntl.bts.gov/view/dot/78710.
Acharya, Sailesh, et al. Validating the Collection of Skid Data by Assessing Correlation With Crash Data. Utah. Dept. of Transportation. Division of Research, 2024, Report no. UT-24.13, ROSA P. https://rosap.ntl.bts.gov/view/dot/78710.
Bridge strikes—events where over-height vehicles impact bridge superstructures—are common across the United States and pose significant challenges for bridge owners. When a bridge strike occurs, bridge owners must assess the damage and determine what, if any, action is required. A survey of state highway agencies was conducted, and 23 responses wer
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Schissler, L. R., Ahershinge, S., Ibrahim, A. E., Fahnestock, L. A., LaFave, J. M., & Elbanna, A. E. (2024). Report on Agency Survey and National Bridge Inventory Analysis for Damaged Steel Girders (Report No. FHWA-ICT-24-021). Illinois Center for Transportation. https://doi.org/10.36501/0197-9191/24-024
Schissler, Limo R, Sanjana Ahershinge, Ahmed E Ibrahim, Larry A Fahnestock, James M. LaFave, and Ahmed E Elbanna. Report on Agency Survey and National Bridge Inventory Analysis for Damaged Steel Girders. Report no. FHWA-ICT-24-021. Illinois Center for Transportation, 2024. https://doi.org/10.36501/0197-9191/24-024.
Schissler, Limo R, et al. Report on Agency Survey and National Bridge Inventory Analysis for Damaged Steel Girders. Illinois Center for Transportation, 2024, Report no. FHWA-ICT-24-021, ROSA P. https://doi.org/10.36501/0197-9191/24-024.
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