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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.

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Showing 5121 - 5140 of 36908 results
  • Field Implementation of Compacted Concrete Pavement
    Field Implementation of Compacted Concrete Pavement
    Khayat, Kamal H. ;
    Farzadnia, Nima
    2020-05-01 | PDF
    The main objective of this research is to investigate the performance of Compacted Concrete Pavement (CCP) with special design features of surface texture that can reduce construction cost and secure safe and durable surface texture. This research was part of a larger project undertaken by the City of Mexico, Missouri in collaboration with Missouri ...
  • Evaluation of Hardened Paint Pavement Markings
    Evaluation of Hardened Paint Pavement Markings
    Dwyer, Carmine E. ;
    Becker, Rachel L.
    2020-05-01 | PDF
    The objective of this study was to obtain and analyze relevant technical and performance data of various pavement marking products to determine which products can be used to stripe various roadway surfaces and to withstand the spectrum of Arizona weather, ranging from intense ultraviolet exposure to abrasion from snowplow blades. Data gathering con ...
  • Evaluation of Truck Tonnage Estimation Methodologies Summary
    Evaluation of Truck Tonnage Estimation Methodologies [Summary]
    Zhong, Monica ;
    Kaisar, Evangelos I.
    2020-05-01 | PDF
    The primary objective of this study was to evaluate the current methodologies for estimating truck tonnage through a literature review and identify alternatives that could improve Florida’s current truck tonnage formula. The development of a new truck tonnage model was also an option.
  • Understanding the Effects of Slope Ratio Straw Mulching and Compost Addition to Topsoil to Establish Permanent Vegetation and Reduce Nutrient Runoff
    Understanding the Effects of Slope Ratio, Straw Mulching, and Compost Addition to Topsoil to Establish Permanent Vegetation and Reduce Nutrient Runoff
    Owen, Dylan ;
    Davis, Allen P
    2020-05-01 | PDF
    Soil erosion management is a major environmental challenge facing highway construction. This project analyzes sustainable improvements to current standard procedures for final grade turfgrass establishment on disturbed soils. Using a series of greenhouse studies, two compost types, biosolids and greenwaste, and four compost/topsoil blends were comp ...
  • Enhancing Existing Isolated Underpasses With Fencing To Decrease Wildlife Crashes and Increase Habitat Connectivity
    Enhancing Existing Isolated Underpasses With Fencing To Decrease Wildlife Crashes and Increase Habitat Connectivity
    Donaldson, Bridget M. ;
    Elliott, Kaitlyn E. M.
    2020-05-01 | PDF
    The impact of wildlife-vehicle collisions on drivers and wildlife populations has been gaining increasing attention in the United States. Given the established success of wildlife crossings with fencing in reducing wildlife crashes and connecting habitat, a growing number of states, including Virginia, have enacted wildlife corridor legislation, so ...
  • Evaluation of Bridge Deck Treatments Along I15 in Nephi Utah
    Evaluation of Bridge Deck Treatments Along I-15 in Nephi, Utah
    Mikulich, Matthew
    2020-05-01 | PDF
    This report reviews the available condition, history, and chloride testing results of twenty-two (22) reinforced concrete bridge decks on I-15 near Nephi, Utah from milepost 221 to 228. The bridges in this research group were constructed in the same era with similar details, and also experienced comparable vehicular and environmental loads. Each of ...
  • Enhanced Characterization of RAP for Cracking Performance Summary
    Enhanced Characterization of RAP for Cracking Performance [Summary]
    Moseley, Howard L ;
    Roque, Reynaldo
    2020-05-01 | PDF
    University of Florida researchers evaluated the effect of RAP binder stiffness, fineness, and gradation on cracking resistance to determine whether the current maximum RAP usage in polymer-modified asphalt (PMA) mixtures can be increased. They also examined the effect of RAP on asphalt mixtures made with high polymer (HP) binder. If more RAP could ...
  • Traffic Safety Facts 2018 Data RuralUrban Comparison of Traffic Fatalities
    Traffic Safety Facts 2018 Data: Rural/Urban Comparison of Traffic Fatalities
    United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis
    2020-05-01 | PDF
    For this fact sheet, rural and urban boundaries are determined by the State highway departments and approved by the Federal Highway Administration. The State highway departments use the boundaries decided by the Census Bureau. In this fact sheet for 2018, the information about rural and urban traffic fatalities is presented as follows: Overview; En ...
  • Revisiting TODs: How Subsequent Development Affects the Travel Behavior of Residents in Existing Transit-Oriented Developments [supporting datasets]
    Portland State University. Transportation Research and Education Center (TREC)
    2020-05-01 | PDF
    Portland State University has worked with the Portland Metro regional government periodically since 2005 to survey occupants of buildings for which developers had received funding from Metro’s Transit-Oriented Development (TOD) Program. This research extends upon the prior TOD surveys in Portland by revisiting a set of developments with a second wa ...
    Dataset Supporting Files
  • Utilizing Kryton KIM Technology in Bridge Deck and Rail Construction to Protect against Chloride Ion Penetration
    Utilizing Kryton KIM Technology in Bridge Deck and Rail Construction to Protect against Chloride Ion Penetration
    Syslo, Mick ;
    Heyen, Wally
    2020-05-01 | PDF
    The Purpose of this investigation was to determine if KIM is a suitable admixture for protecting bridge decks and rails against chloride penetration.
  • Understanding OversizeOverweight Industry Freight Flow and Safety in Kansas Using the Kansas Truck Routing and Intelligent Permitting System KTRIPS
    Understanding Oversize/Overweight Industry Freight Flow and Safety in Kansas Using the Kansas Truck Routing and Intelligent Permitting System (K-TRIPS)
    Morris, Blake ;
    Fitzsimmons, Eric J.
    2020-05-01 | PDF
    Oversize and overweight (OSOW) trucks are an integral part of traffic movement throughout the state of Kansas and the United States as a whole, along with the freight they haul. The unique dimensions (length, width, height, and weight) of these loads makes the movement of them more challenging, and less safe for all on the road. With key east-west ...
  • Service Life Enhancement of Substrates Overlaid With Thin Overlays UTBWC Chip Seals and MicroSurfacing
    Service Life Enhancement of Substrates Overlaid With Thin Overlays (UTBWC, Chip Seals, and Micro-Surfacing)
    Blanchette, Andrea ;
    Lee, Sheue Torng
    2020-05-01 | PDF
    Non-structural overlays such as ultra-thin bonded wearing course (UTBWC), chip seals, and micro-surfacing are commonly applied as a preventive maintenance method to extend the service life of a pavement. They are generally placed over flexible substrates, which include flexible pavements that have received bituminous interventions on bituminous upp ...
  • Quantifying Pile Rebound with Deflection Measuring Systems Best Suited for Florida Soils
    Quantifying Pile Rebound with Deflection Measuring Systems Best Suited for Florida Soils
    Cosentino, Paul J. ;
    Bostater Jr, Charles R
    2020-05-01 | PDF
    Certain blends of very fine sands, silts, and clays are producing pile rebound during driving. Two major high rebound items were evaluated during this research: the possibility of using new pile movement techniques during driving to validate or check pile driving analyzer (PDA) deflections and the evaluation of cyclic triaxial test data to determin ...
  • Pedestrian Crosswalk Policy Development Guidelines
    Pedestrian Crosswalk Policy Development Guidelines
    Miner, Kate ;
    Arvidson, Tim
    2020-05-01 | PDF
    This study was driven by the need to improve consistency in the methods and approach that local agencies use to address crosswalks. This study focuses on the question of how a crosswalk should be enhanced with additional countermeasures, if any, once the decision is made to mark it. During the research portion of this project, it was found that the ...
  • Assessing the Impact of PedestrianActivated Crossing Systems
    Assessing the Impact of Pedestrian-Activated Crossing Systems
    Hourdos, John ;
    Dirks, Peter
    2020-05-01 | PDF
    Pedestrian-Activated Crossing (PAC) systems have been shown to have a generally positive impact on driver yield rates. However, there has been insufficient research on the effect PAC treatments have on pedestrian crash rates, and there is little guidance as to when and where each treatment should be used. This study estimates the effects of PACs on ...
  • Load Rating Strategies for Bridges With Limited or Missing AsBuilt Information
    Load Rating Strategies for Bridges With Limited or Missing As-Built Information
    Harris, Devin K. ;
    Ozbulut, Osman E.
    2020-05-01 | PDF
    Load rating is the process of determining the safe load-carrying capacity of a bridge; however, when plans and details are insufficient to determine the overall capacity of the structure, alternative methods must be used to infer what the live load capacity is. Two viable methods allowed by the AASHTO Manual for Bridge Evaluation are the commonly u ...
  • Spray on Rejuvenators Synthesis
    Spray on Rejuvenators Synthesis
    Blanchette, Andrea ;
    Lee, Sheue Torng
    2020-05-01 | PDF
    Spray on rejuvenators, designed to penetrate into the asphalt pavement to a certain depth, can be applied to hot mix asphalt (HMA) pavement surfaces, serving as a cost-effective method intended to reverse the effects of aging. Rejuvenators strengthen the HMA material at the surface to resist the detrimental effects of exposure to sun, water, and ai ...
  • Central HMA Acceptance Lab Process Improvement Implementation Plan Project
    Central HMA Acceptance Lab Process Improvement Implementation Plan Project
    Boehm, Ted W. ;
    Handy, Jim
    2020-05-01 | PDF
    The Indiana Department of Transportation (INDOT) Central Hot Mix Asphalt (HMA) Acceptance Lab was opened on March 29, 2018 at the Office of Materials Management (OMM) facility in Indianapolis. The state-of-the-art lab conducts acceptance testing on HMA samples from INDOT’s Crawfordsville and Greenfield districts, as well as testing of appeals sampl ...
  • Effect of Socioeconomic Factors on Crash Occurrence
    Effect of Socioeconomic Factors on Crash Occurrence
    Stamatiadis, Nikiforos ;
    Sagar, Shraddha
    2020-05-01 | PDF
    Road traffic crashes are a leading cause of death in the United States. In Kentucky, per capita crash rates and crash-related fatalities have outpaced the national average for over a decade. Wanting to explain why the U.S. Southeast sees higher crash rates than other regions, researchers have argued the region’s unique socioeconomic conditions prov ...
  • MASH Evaluation of TxDOT Roadside Safety FeaturesPhase III
    MASH Evaluation of TxDOT Roadside Safety Features—Phase III
    Bligh, Roger P. ;
    Menges, Wanda L.
    2020-05-01 | PDF
    In 2009, the American Association of State Highway and Transportation Officials (AASHTO) published the Manual for Assessing Safety Hardware (MASH), which supersedes the previous crash test and evaluation guidelines. A MASH implementation agreement was jointly developed and adopted by the Federal Highway Administration and AASHTO. It establishes imp ...
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