In this report, researchers present an assessment framework for evaluating the expected crash consequences of performing a particular work activity on a given highway at night versus doing that same activity during the day. Researchers predicate the framework on the availability of normal crash rates (crashes per 100 million-vehicle-miles), differe
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Researchers present a summary of the extent and type of nighttime work zone activity that currently occurs in Texas; an analysis of Department of Public Safety crash data to assess the ramifications of night work on crash experiences; and an assessment of differences in operational characteristics of traffic at nighttime and daytime work zones. Res
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Project 0-4745 developed a geographic information system (GIS)-based approach for the determination of patterns in the spatial and temporal distribution of incidents along freeway corridors. The research documented incident detection and data archival at several transportation management centers (TMCs) in Texas, a process to develop a data model an
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Project 0-4745 developed a geographic information system (GIS)-based approach for the determination of patterns in the spatial and temporal distribution of incidents along freeway corridors. The research documented incident detection and data archival at several transportation management centers (TMCs) in Texas, a process to develop a data model an
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A new methodology that uses recent advances in unsaturated soil mechanics and hydrology was developed and tested. The approach consists of using soil suction and moisture content field information in the prediction of the likelihood of landslide movement. The testing ground was an active landslide on I-70 west of the Eisenhower/Johnson Memorial Tun
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This report documents the results of the second year of Project 0-4740, Improved Quantification of High-Occupancy Vehicle (HOV) Lane Delay Savings. Year two contained three tasks: (1) Task 4: document methodologies used for improved quantification of HOV lane travel time savings including incident conditions, which meets the requirements for Produc
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High Occupancy Vehicle (HOV) lanes provide travel time savings and offer a more reliable trip time to users. Historically, the determination of travel time savings on HOV lanes as compared to general-purpose lanes is calculated using data collected on days without incidents. The objective of this research is to determine the effect on travel time t
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The study monitored the effectiveness of the CDOT US 160 Dry Creek Wildlife Mitigation Project, located between Durango and Bayfield in Southwest of Colorado. Mitigation included a wildlife crossing structure at mile post (MP) 97.42, wildlife exclusion fence on both sides of US 160 from MP 97.05 to MP 97.82, and two EnviroGrid® Geocell treatments p
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Alternative Intersection and Interchange (AII) designs provide an innovative approach to the geometric and control features at intersections. Nevertheless, most of the AII designs have unconventional ways to maneuver through the intersection such as restriction of movements, crossover of traffic to the opposite side of the road, separating left tur
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Closed-loop systems are widely implemented in Texas arterials to provide efficient operation of arterial intersections while still providing signal progression. Nevertheless, poor progression can be observed along most arterials due to outdated offsets, short-term variations in traffic patterns (early-return-to-green), or changes in arterial’s spee
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Closed-loop systems are widely implemented in Texas arterials to provide efficient operation of arterial intersections while still providing signal progression. Nevertheless, poor progression can be observed along most arterials due to outdated offsets, short-term variations in traffic patterns (early-return-to-green), or changes in arterial's spee
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Traffic control devices applied to the pavement can provide a significant amount of information for the driver. The objective of this research was to assess the effectiveness of various pavement marking materials, devices, and treatments that have potential to increase driver awareness and safety. The following pavement marking materials, devices,
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As the proportion of highway needs that can be supported by fuel taxes declines, the attractiveness of toll funding rises. Public agencies and local authorities are examining their options and some states, notably Texas, have broadly increased the range of local toll-related options available. These entities need an analytical tool that will allow
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In this project, researchers conducted an extensive sensitivity analysis of the new Mechanistic-Empirical Pavement Design Guide, the development of default input files, and a review of current procedures to develop an implementation strategy and justification of the new pavement design guide. The sensitivity analysis was conducted for the primary d
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Recent changes in aviation safety oversight in the Federal Aviation Administration (FAA) and globally have incorporated performance-based oversight (PBO) that assesses an organization's management system effectiveness in achieving defined safety objectives. PBO is intended to be complementary to traditional compliance-based oversight that examines
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The process of submitting an application for research involving human participants to the Institutional Review Board (IRB) at the Federal Aviation Administration (FAA) William J. Hughes Technical Center for Advanced Aerospace needs modernization. We conducted an evaluation of the first iteration of a newly proposed electronic Institutional Review B
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Human factors is designing to match the capabilities and limitations of the human user. The objectives of this human-centered design process are (1) to maximize the effectiveness and efficiency of system performance, (2) to ensure a high level of safety, and (3) to maximize user acceptance. These objectives are achieved by systematically applying r
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United States. Department of Transportation. Federal Highway Administration
2020-09-01
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Many steel bridges are currently in need of maintenance. Maintenance operations may range from small component replacement jobs to major maintenance activities including repainting. Many steel bridges in the highway system are coated with paint that contains toxic heavy metal pigments (e.g., lead, chromate) in varying concentrations. These metals c
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The report contains the results of a test performed to evaluate an on-board data acquisition system in a crash test environment. The test was performed at the Federal Outdoor Impact Laboratory (FOIL) located in McLean, Virginia. The data acquisition system was manufactured by DSP Technologies, Incorporated. Data collected by the on-board system was
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United States. Department of Transportation. Federal Highway Administration
2015-05-04
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This presentation covers highway transportation, FHWA EAR program investments in sensor systems, and interest in passive wireless sensors for highways.
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