United States. Department of Transportation. National Highway Traffic Safety Administration. National Center for Statistics and Analysis. Mathematical Analysis Division
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2026-05-01
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PDF
This report presents results from the annual (2025) National Occupant Protection Use Survey (NOPUS) Controlled Intersection Study, the only nationwide probability-based occupant restraint use survey. While it found no significant changes for front-seat belt use, it revealed twelve 12 significant increases for rear-seat belt use alongside several pe
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United States. Department of Transportation. Bureau of Transportation Statistics
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2026-05-01
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PDF
Fleet GPS (Global Positioning System) data are a form of probe data generated by systems of hardware and software installed on and connected to a trucking fleet’s tractors. Fleet owners rely on these data—which are generated via onboard diagnostics (OBD) units that can be embedded in their trucks at manufacture or installed in cabs already on the r
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United States. Department of Transportation. Bureau of Transportation Statistics
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2026-05-01
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PDF
An Electronic Logging Device (ELD) is a piece of hardware that automatically records a commercial motor vehicle (CMV) driver’s driving time and automatically maintains their hours-of-service (HOS) records. Mandated by the Federal Motor Carrier Safety Administration (FMCSA), ELDs are required for most motor carriers and drivers, including commercial
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2018-10-24
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Highway Safety Improvement Program Annual Reports
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The Highway Safety Improvement Program (HSIP) is a core Federal-aid program with the purpose of achieving a significant reduction in fatalities and serious injuries on all public roads. As per 23 U.S.C. 148(h) and 23 CFR 924.15, States are required to report annually on the progress being made to advance HSIP implementation and evaluation efforts.
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United States. Department of Transportation. Bureau of Transportation Statistics
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2026-05-01
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PDF
Cell phones directly produce two types of probe data, both of which leverage the spatiotemporal information derivable from the relative strength of a phone’s connection to cell towers owned by its corresponding mobile phone carrier: event-driven call detail records (CDRs) and network-driven passive-signaling data. Both data types are available from
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The purpose of this project was to evaluate and refine the April 1979 version of the Beacon Collision Avoidance System (BCAS) logic prior to Active BCAS prototype flight testing. The April 1979 version of the BCAS logic added changes to support multiple aircraft conflict resolution, Conflict Indicator Register (CIR) interfacing and new surveillance
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The INDOT Long-Range Planning Section has developed a set of planning tools that will support the system-level analysis of the state transportation system. These tools are employed to monitor transportation system performance, identify highway needs, and provide a quantitative analysis of the impacts of transportation improvement projects. One such
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This data report documents the Microwave Landing System (MLS) clearance format assessment tests performed at the Federal Aviation Administration Technical Center from January through February 1980. The test data were provided for inclusion 1.n the United States presentation for the International Civi1 Aviation Organization (ICAO) All-Weather Operat
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This study presents the development and implementation of a Balanced Mix Design (BMD) framework customized for Oregon’s materials, traffic, and climate conditions, aiming to improve asphalt pavement durability, environmental performance, and cost-effectiveness. While traditional volumetric mix designs have been widely adopted, they may sometimes le
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In the analysis of the a-a tracking filter, it 1s normally assumed that the tracking filter and data source operate in synchronism at a constant data rate. An analytical solution is obtained for the case in which the tracking filter and data source operate asynchronously, thus violating the standard assumptions. To compensate for the asynchronous o
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The purpose of this project was to evaluate and refine the April 1979 version of the Beacon Collision Avoidance System (BCAS) logic prior to Active BCAS prototype flight testing. The April 1979 version of the BCAS logic added changes to support multiple aircraft resolution, conflict indicator register interfacing, and new surveillance function inte
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The September 1975 Supplemental Report to the Final System Plan provides a technical implementation supplement to the United States Railway Association’s July 1975 Final System Plan. Whereas Volume I set out the principal restructuring, financial, legal, passenger-service, manpower, marketing, and property-designation framework, and Volume II addre
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Volume 2 of the United States Railway Association’s Final System Plan addresses one of the most difficult implementation problems created by the Northeast and Midwest railroad crisis: how to distinguish rail properties that should be incorporated into a financially viable Conrail system from light-density lines whose continued operation would requi
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Volume I of the United States Railway Association’s Final System Plan presents the core policy, operating, financial, and legal framework for restructuring the bankrupt railroads of the Northeast and Midwest into a viable regional rail system. Prepared under the Regional Rail Reorganization Act of 1973 (3R Act) and later implemented through the Rai
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Mechanically Stabilized Earth (MSE) walls may intersect utilities such as pipes and culverts, which may be located within the reinforced backfill or foundation soil. Evidence from previous failures has shown that leakage or collapse of these utilities can lead to severe deformation or loss of wall integrity. Despite the critical implications of pip
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Traditionally, soil mechanics has focused on the behavior of two distinct types of geomaterials: clean sands and pure clays. Under the application of external loads, these two types of geomaterials represent and are conveniently associated with two extreme types of soil responses: drained and undrained behavior. The drained behavior of clean sands
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Traditionally, soil mechanics has focused on the behavior of two distinct types of geomaterials: clean sands and pure clays. Under the application of external loads, these two types of geomaterials represent and are conveniently associated with two extreme types of soil responses: drained and undrained behavior. The drained behavior of clean sands
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This project evaluated practical strategies for improving the cracking resistance of asphalt surface mixtures in Alabama while ensuring adequate resistance to rutting. The study focused on Superpave surface mixtures commonly used by the Alabama Department of Transportation (ALDOT) and examined three types of adjustments: binder content and grade, a
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The TRC 2303 report presents a comprehensive analysis of the impacts of bridge closures across the Mississippi River in Arkansas, focusing on four key crossings: I-40, I-55, HWY 49, and HWY 82. Prompted by the emergency closure of the I-40 Hernando de Soto Bridge in 2021, the study evaluates both full and partial closures to quantify economic, safe
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A laboratory model microcomputer-based Runway Visual Range (RVR) System was designed and built at the Federal Aviation Administration (FAA) Technical Center. The system includes a Microcomputer Signal Data Converter (SOC), a Remote Display, a local maintenance terminal, a cassette storage unit, a Transmissivity Display, and a Transmissometer Simula
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United States Department of Transportation
Sukhija, Mayank