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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 5061 - 5080 of 36958 results
  • Crash Modification Factor Recommendation List
    Crash Modification Factor Recommendation List
    Souleyrette, Reginald ;
    Tanzen, Riana
    2020-06-01 | PDF
    Practitioners use Crash Modification Factors/Functions (CMFs) to calculate the number of crashes expected once a countermeasure has been implemented. When evaluating design alternatives, CMFs can be used in conjunction with safety performance functions (SPFs) to derive crash predictions. The Federal Highway Administration (FHWA) maintains the CMF C ...
  • Identification of Tourist Flows in Florida to Support Development of Tourist Travel Module for FDOT Florida Transportation Model
    Identification of Tourist Flows in Florida to Support Development of Tourist Travel Module for FDOT Florida Transportation Model
    Kirilenko, Andrei ;
    Kim, Jin Won
    2020-06-01 | PDF
    Continued use of Florida Statewide Model (FLSWM) poses a number of important limitations in terms of tourist-oriented traffic flow, accidents, potential revenue and maintenance considerations. The overall goal of the project was to enable Florida Department of Transportation (FDOT) to better monitor and forecast traffic flow by separate considerati ...
  • Testing Procedures for Long Life Heavy Duty Stabilized Bases
    Testing Procedures for Long Life Heavy Duty Stabilized Bases
    Ashtiani, Reza S. ;
    Tarin, Jose
    2020-06-01 | PDF
    Fatigue cracking is one of the major types of distresses observed in pavement structures due to repeated traffic loads. The new mechanistic pavement design protocols, such as TxME, require modulus of rupture of the materials as input to the fatigue performance models. This report discusses the practical and theoretical issues associated with tradit ...
  • The Calibration of the AASHTO ASD and LRFD for Maryland Sign and High Mast Lighting Structure Design
    The Calibration of the AASHTO ASD and LRFD for Maryland Sign and High Mast Lighting Structure Design
    Fu, Chung C. ;
    Ye, Yunchao
    2020-06-01 | PDF
    The Maryland Department of Transportation State Highway Administration (MDOT SHA) is working to update the standard design for sign and mast arm lighting structures. The following tasks were performed as a part of this research to assist with the update process: (1) Complete design parameters of MD-specified sign; (2) Defining wind pressure applica ...
  • Synthesis on the Contributing Factors and Effective Countermeasures for LowVolume Roadway Fatality Rates in the Southeast
    Synthesis on the Contributing Factors and Effective Countermeasures for Low-Volume Roadway Fatality Rates in the Southeast
    Stamatiadis, Nikiforos ;
    Weast, Jennifer
    2020-06-01 | PDF
    In the Southeast US, the largest proportion of fatal crashes occur on low-volume roads (LVRs). Many state transportation agencies have recognized this problem and are implementing countermeasures to reduce fatality rates. This synthesis contributes to ongoing efforts to lower crash rates on LVRs by identifying and describing countermeasures for imp ...
    Supporting Files
  • FullDepth Reclamation of Asphaltic Concrete Pavements
    Full-Depth Reclamation of Asphaltic Concrete Pavements
    Beckham, Tony ;
    Rister, Brad
    2020-06-01 | PDF
    The Kentucky Transportation Cabinet (KYTC) has used a full-depth reclamation (FDR) process over the past few years to rehabilitate asphalt pavements exhibiting widespread base failures. FDR transforms existing hot-mix asphalt (HMA) pavement and underlying granular materials into a stabilized base layer. The stabilized layer is then overlaid with a ...
  • Assessing the Effectiveness of Potassium Acetate to Control Snow and Ice on Minnesota Highways
    Assessing the Effectiveness of Potassium Acetate to Control Snow and Ice on Minnesota Highways
    Waidley, Greg ;
    Hirt, Brian
    2020-06-01 | PDF
    As an alternative for snow and ice control, potassium acetate (KAc) has potential advantages compared with salt and brine—reduction of chlorides entering receiving waters, a lower effective deicing temperature, and reduction in corrosion impacts—but success in the field has been largely anecdotal. MnDOT District 1 worked with an investigator team t ...
  • Potential Effect of Cable Median Barriers on Commercial Vehicle Crossover Crashes
    Potential Effect of Cable Median Barriers on Commercial Vehicle Crossover Crashes
    Stamatiadis, Nikiforos ;
    Sagar, Shraddha
    2020-06-01 | PDF
    In 2016, commercial motor vehicles (CMVs) were involved in 4,079 fatal crashes in the U.S., representing 11.8 percent of all fatal crashes. State of Kentucky crash data for 2015-2016 show that per capita crash rates and increases in crash-related fatalities exceeded the national average. Crossover crashes occur when a vehicle leaves its intended pa ...
  • Development of MASH TL3 Transitions for Cast in Place Concrete Barriers
    Development of MASH TL-3 Transitions for Cast in Place Concrete Barriers
    Sheikh, Nauman M. ;
    Moran, Sana M
    2020-06-01 | PDF
    The objective of this project was to develop transition designs for three cast in place concrete barrier combinations. These included transitions for connecting (a) TxDOT’s 36-inch tall Single Slope Traffic Rail (SSTR) to 42-inch tall Single Slope Concrete Barrier (SSCB), (b) 32-inch tall F-shape concrete barrier to SSCB, and (c)TxDOT’s 32-inch tal ...
  • Bridge Structural Analyses for Staged Construction and Constructability Reviews
    Bridge Structural Analyses for Staged Construction and Constructability Reviews
    Aktan, Haluk M ;
    Attanayake, Upul
    2020-05-31 | PDF
    Constructability requirements need to be addressed during the design of highway bridges. However, the typical design practice is to consider the limit state stresses in structural elements of a bridge that is completed as per the project specifications. This process leaves the responsibility of analysis and design for construction stages to a contr ...
  • Greensburg Vehicle and Pedestrian Study South Main Street between West Otterman and Pittsburgh Street
    Greensburg Vehicle and Pedestrian Study: South Main Street between West Otterman and Pittsburgh Street
    Holland, Kevin ;
    Pires, Bernardo R.
    2020-05-21 | PDF
    The Intelligent Mobility Meter (IMM) is a portable data acquisition and analysis platform for the collection of fine-grained statistics on pedestrian, cyclist and vehicular traffic. This study used the IMM to provide real-world, valuable, traffic data and actionable information to local government entities. This study focuses on the deployment of t ...
  • Planning for the Inevitable Readying DOTs for Disaster Debris Management
    Planning for the Inevitable: Readying DOTs for Disaster Debris Management
    McNeil, Sue ;
    Woody, Michelle
    2020-05-19 | PDF
    Hurricanes, tornadoes, floods, and other natural disasters result in significant debris, which impedes mobility and presents a challenge to state and local transportation agencies for the removal of debris and inspecting and repairing roads and bridges that are damaged. Debris management involves understanding regulations versus guidance, reimburse ...
  • SPARKMAN: A Smart Parking Management Tool for University Campuses [supporting dataset]
    Cheu, Ruey Long ;
    Gurbuz, Okan
    2020-05-17 | PDF
    PI Kelvin Cheu and his students have developed a total parking demand model for students and a “base price” model for student parking permits based on data gathered from an internet survey on parking at 208 university campuses across the United States. This project aims to develop a student parking lot zoning and zone permit pricing model, and then ...
    Dataset Supporting Files
  • A MultiModel Approach Toward Understanding Iron Fouling at RockFill Drainage Sites Along Roadways in New Hampshire USA
    A Multi-Model Approach Toward Understanding Iron Fouling at Rock-Fill Drainage Sites Along Roadways in New Hampshire, USA
    Lombard, Melissa A ;
    Lombard, Pamela J.
    2020-05-14 | PDF
    Factors affecting iron fouling in wet areas adjacent to roadways were investigated by collecting field rock cut and aqueous physicochemical data; developing exploratory predictive models; and developing geochemical models. Basic data included the identification of iron fouling from aerial imagery and field visits at 374 New Hampshire rock cut locat ...
  • State of Practice and Literature Review on Foundations for Coastal Traffic Signal Mast Arm Structures
    State of Practice and Literature Review on Foundations for Coastal Traffic Signal Mast Arm Structures
    Rodriguez, Carlos M ;
    Pando, Miguel A.
    2020-05-14 | PDF
    This report presents a state of practice and literature review study conducted as part of NCDOT Research Project RP 2018-17 on foundations for coastal mast arm traffic signal structures. The original scope of this project involved experimental and computation research on alternative foundation systems for support of coastal mast arm traffic signal ...
  • Funding Strategies for Transit Agencies in South Dakota
    Funding Strategies for Transit Agencies in South Dakota
    Donahue, Corinne ;
    Worker-Braddock, Tom
    2020-05-13 | PDF
    This study focused on funding strategies for transit agencies in South Dakota, with two primary focuses – 1) identifying traditional and non-traditional funding sources and 2) developing a fare strategy framework for transit agencies – no matter the size or location of the agency.
  • Final Report Clear Recovery Zone Vegetation Requirements and Review of Current Tree Pruning and Maintenance Practices for Landscape Urban and Rural Areas within the Right of Way
    Final Report: Clear Recovery Zone Vegetation Requirements, and Review of Current Tree Pruning and Maintenance Practices for Landscape, Urban, and Rural Areas within the Right of Way
    Koeser, Andrew ;
    Blair, Seth
    2020-05-13 | PDF
    Though not its primary mission, the Florida Department of Transportation (FDOT) is one of the most significant tree planting organizations in the state. This research investigates the effectiveness of their existing contracts and tree planting management efforts. In an assessment of 2711 planted trees and palms, the authors found that 98.5% survive ...
  • Do Special Bike Programs Promote Public Health A case study of New York Citys Citi Bike bike sharing program Or Investigating the Health Effect of the Citi Bike Bikesharing Program in New York City Using the ITHIM Health Assessment Tool
    Do Special Bike Programs Promote Public Health? A case study of New York City’s Citi Bike bike sharing program Or Investigating the Health Effect of the Citi Bike Bike-sharing Program in New York City Using the ITHIM Health Assessment Tool
    Hou, Zenghao ;
    Wu, Kanglong
    2020-05-11 | PDF
    Bike travel is often considered as a healthy and environmentally friendly mode of travel and promoted by cities. Bike sharing, as a bike usage boosting program, invigorates these advantages. However, as usage of it rises, so do the adverse effects on cyclists’ physical well-being, such as hazardous air exposure and bicycle involved accidents. The n ...
  • Highway Rock Cut Inventory and Failure Potential Allegany County Maryland
    Highway Rock Cut Inventory and Failure Potential, Allegany County, Maryland
    Brezinski, David K. ;
    Adams, Rebecca Kavage
    2020-05-11 | PDF
    One hundred ninety-five, MDOT SHA-maintained, roadway embankments in Allegany County, Maryland, were cataloged as to the effects of climate, vegetation, and geology factors on slope stability. Observations included dimensions, weathering condition, and geologic structure. Recorded data was employed to evaluated the potential for slope failure such ...
  • Development of a PosttoDeck Connection for a TL4 SteelTube Bridge Rail
    Development of a Post-to-Deck Connection for a TL-4 Steel-Tube Bridge Rail
    Mauricio, Pascual ;
    Rasmussen, Jennifer D.
    2020-05-07 | PDF
    A new post-to-deck connection was designed for mounting an upcoming Manual for Assessing Safety Hardware, Second Edition (MASH 2016) Test Level 4 (TL-4) steel-tube bridge rail to the side of the bridge deck to limit the impact load transferred to the deck and to minimize the propensity for deck damage during impacts. With preference for the bridge ...
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