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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 1281 - 1300 of 36873 results
  • First and Last Mile Connectivity for Missourians Research Summary
    First and Last Mile Connectivity for Missourians [Research Summary]
    Villagran, Alvaro
    2024-09-01 | PDF
    This report discusses first-last mile transportation with a focus on access to employment. The Project Team examined first-last mile transportation services in other states in a variety of contexts, as well as the existing transportation landscape in Missouri.
  • Evaluating Sedimentation Impacts to Freshwater Mussels
    Evaluating Sedimentation Impacts to Freshwater Mussels
    Zhu, Wenyu ;
    Deng, Baolin
    2024-09-01 | PDF
    Transportation system construction activities can cause increased suspended and redeposited solids in adjacent water systems, which may adversely impact freshwater mussels. The objectives of this study are to evaluate the impacts of suspended solids on juvenile mussels including to establish the impact thresholds, to assess the effects of sediment ...
  • Roadway Cross Section Reconfiguration Responses to 14 Commonly Asked Questions Tech Brief
    Roadway Cross Section Reconfiguration: Responses to 14 Commonly Asked Questions [Tech Brief]
    Iowa State University. Institute for Transportation
    2024-09-01 | PDF
    This summary addresses some of the access management measures that might be considered when a four- to three-lane or other cross section conversion project is being implemented. Several access issues identified and discussed in the Road Diet Informational Guide (Knapp et al. 2014) are listed, and other measures included in the Iowa DOT Access Manag ...
  • Evaluating the Robustness of MDSS Forecast and Compliance with Recommendations Summary
    Evaluating the Robustness of MDSS Forecast and Compliance with Recommendations [Summary]
    Bullock, Darcy M.
    ORCID ICON IMG
    2024-09-01 | PDF
    The Indiana Department of Transportation (INDOT) adopted the Maintenance Decision Support System (MDSS) for user-defined plowing segments in the winter of 2008–2009. Since then, many new data sources, including connected vehicle data, enhanced weather data, and fleet telematics have been integrated into INDOT winter operations activities. The objec ...
  • Determining the Effectiveness of Commercial Vehicle Safety Alerts Fact Sheet
    Determining the Effectiveness of Commercial Vehicle Safety Alerts [Fact Sheet]
    Kidando, Emmanuel ;
    Kitali, Angela E
    2024-09-01 | PDF
    The Ohio Department of Transportation has partnered with Drivewyze to improve safety and mobility on Ohio’s highways, focusing on commercial vehicle safety alerts (CVSAs). Through this partnership, Drivewyze provides commercial motor vehicle (CMV) drivers with real-time alerts via in-cab electronic logging devices (ELDs). The alerts are intended to ...
  • Use of Iowa Eggshell Waste as BioCement Materials in Pavement and Gravel Road GeoMaterial Stabilization Tech Transfer Summary
    Use of Iowa Eggshell Waste as Bio-Cement Materials in Pavement and Gravel Road Geo-Material Stabilization [Tech Transfer Summary]
    Ceylan, Halil ;
    Kim, Sunghwan
    2024-09-01 | PDF
    This study aimed to evaluate the performance of Iowa eggshell waste in improving the engineering properties of Iowa geo-materials and to establish recommendations for the use of Iowa eggshell powder (ESP).
  • Control Guidelines for Aggregate Drainage Layers and Evaluation of In Situ Permeability Testing Methods for Aggregates
    Control Guidelines for Aggregate Drainage Layers and Evaluation of In Situ Permeability Testing Methods for Aggregates
    Garzon-Sabogal, Luis ;
    Getchell, Amy
    2024-09-01 | PDF
    This project examined the use of the light weight deflectometer (LWD) and the air permeameter test (APT) for control of the state of compaction and hydraulic conductivity of aggregate drainage layers. The investigation included an extensive program of LWDs, APTs, and nuclear density tests on two testing strips constructed at an experimental site—on ...
  • Determining the Effectiveness of Commercial Vehicle Safety Alerts
    Determining the Effectiveness of Commercial Vehicle Safety Alerts
    Kidando, Emmanuel ;
    Kitali, Angela E
    2024-09-01 | PDF
    The Ohio Department of Transportation has partnered with Drivewyze to improve safety and mobility on Ohio’s highways, focusing on commercial vehicle safety alerts (CVSAs). Through this partnership, Drivewyze provides commercial motor vehicle (CMV) drivers with real-time alerts via in-cab electronic logging devices (ELDs). The alerts are intended to ...
  • Effectiveness of Automated Pavement Restriping Systems Phase I Cost Comparison Between Manual and Automated Systems
    Effectiveness of Automated Pavement Restriping Systems, Phase I: Cost Comparison Between Manual and Automated Systems
    Schrock, Steven D. ;
    Liu, Lanxi
    2024-09-01 | PDF
    The Kansas Department of Transportation (KDOT) is interested in finding a more efficient and accurate restriping system than the current system in use in order to save costs and/or accomplish the same work using fewer field personnel. Therefore, this report details the potential financial advantages for KDOT to deploy an automated pavement restripi ...
  • Safe Truck Mobility for North Dakota Winter Roads
    Safe Truck Mobility for North Dakota Winter Roads
    Zhou, Yun ;
    Vachal, Kimberly
    2024-09-01 | PDF
    Winter storms significantly increase crash risk and disrupt travel, especially under extreme conditions. Gusty winds, heavy moisture, and low temperatures can quickly make travel dangerous in the Northern Plains. This study was aimed at understanding winter truck crashes, given the prominence of commercial vehicle travel in the region’s economy. Tr ...
  • Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
    Use of Drilling Parameters for Enhancing Geotechnical Site Investigations with Applications to Rock Assessment
    Benoit, Jean ;
    Souza, Bruma
    2024-09-01 | PDF
    This report summarizes the research conducted using Measurement While Drilling (MWD) technology that was recently implemented as part of routine geotechnical investigations conducted by the New Hampshire Department of Transportation (NHDOT). MWD is a system that consists of several sensors directly mounted or connected to a drill rig to monitor all ...
  • ActivityBased Model Implementation and Analysis Considerations
    Activity-Based Model Implementation and Analysis Considerations
    Macfarlane, Gregory S ;
    Atchley, Hayden
    2024-09-01 | PDF
    Tour-based and activity-based travel demand models are generally considered more theoretically robust compared to their trip-based counterparts, as activity-based models (ABMs) explicitly model individuals making travel choices in contrast to the aggregate nature of trip-based models. There have been a number of comparisons between trip- and activi ...
  • Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Lessening Density Requirement and Adjusting Density Pay Factors for Asphalt Pavements in Poor Sublayer Conditions
    Kang, Kyubyung ;
    Lee, Jinwoong
    2024-09-01 | PDF
    Current quality control and quality assurance practices for asphalt pavements rely heavily on density (%Gmm) measurements, which are directly linked to pay adjustments. However, these practices can inadvertently encourage over-compaction, leading to issues such as aggregate segregation, crushing, and reduced pavement quality, especially under poor ...
  • Effect of Roadway Lighting on Safety
    Effect of Roadway Lighting on Safety
    Runyan, Samuel L ;
    Bassett, David
    2024-09-01 | PDF
    A significant portion of severe crashes and severe crashes involving vulnerable road users (VRU), 29 percent and 39 percent respectively, occur at night in Utah. Nighttime crash causes are less understood than daytime crashes as there are fewer nighttime crashes, but it is generally assumed that increasing street lighting can help mitigate these cr ...
  • Truck Education and Outreach Partnership for North Dakota
    Truck Education and Outreach Partnership for North Dakota
    Peterson, Del ;
    Bengtson, Kelly
    2024-09-01 | PDF
    The project objectives were as follows: • Objective 1. Engage traditional and new stakeholders in a partnership to increase public awareness and deliver continuous education to prevent large truck crashes in a state truck education and outreach partnership (ND TE-OP). The notion of a TOL would be explored as a facet in the sustained partnership. Th ...
  • Development of Age and State Dependent Stochastic Model for Improved Bridge Deterioration Prediction Brief
    Development of Age and State Dependent Stochastic Model for Improved Bridge Deterioration Prediction [Brief]
    Jia, Gaofeng ;
    Li, Min
    2024-09-01 | PDF
    Reliable and accurate assessment and prediction of bridge condition deterioration is critical for effective bridge preservation. Deterioration models, combined with current condition information, can guide inspection, maintenance, repair, and rehabilitation planning, and support risk and life-cycle analysis. Existing Markov deterioration models, wh ...
  • Grand Forks East Grand Forks Regional ITS Architecture Update Version 50
    Grand Forks - East Grand Forks Regional ITS Architecture Update: Version 5.0
    Hasan, MD Sharijad
    2024-09-01 | PDF
    The Grand Forks-East Grand Forks Regional Intelligent Transportation Systems (ITS) Architecture was developed under the leadership of the Grand Forks-East Grand Forks Metropolitan Planning Organization (GF-EGF MPO). This architecture has been updated three times since its original development—in 2008, 2014, and 2019. The goal of the GF-EGF regional ...
  • Roadway Cross Section Reconfiguration Responses to 14 Commonly Asked Questions
    Roadway Cross Section Reconfiguration: Responses to 14 Commonly Asked Questions
    Knapp, Keith ;
    Veneziano, David
    2024-09-01 | PDF
    The project described in this report was developed in response to a documented need for more readily available guidance related to decision-making about roadway cross section reconfigurations. More specifically, there was a need for information that might help during the decision-making process involved in converting four-lane undivided roadway cro ...
  • A Preliminary EvidenceBased Approach for Forecasting Cut Slope Deterioration
    A Preliminary Evidence-Based Approach for Forecasting Cut Slope Deterioration
    Werley, Keara ;
    Walton, Gabriel
    2024-09-01 | PDF
    Constructed rock slopes may physically deteriorate over time, which can be represented with increasing rockfall frequency. Physical deterioration leads to performance deterioration, which corresponds to changes in slope risk through time. Thus, forecasting physical slope deterioration and therefore slope performance deterioration is critical to the ...
  • Impact of Imperfections Residual Stresses Erection FitUp and Distortion on Curved Steel Bridge Service Life
    Impact of Imperfections, Residual Stresses, Erection Fit-Up and Distortion on Curved Steel Bridge Service Life
    Hammett, Stephen T ;
    Moghadam, Sayed Mohamad Jalali
    2024-09-01 | PDF
    Curved steel girders experience large deflection and rotations during construction and service that can intensify the web breathing effect. In addition, the curvature-induced lateral forces in slender curved webs can lead to critical web boundary stresses that do not typically occur in straight bridges. These distortion mechanisms are amplified by ...
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