Portable changeable message signs (PCMSs) have been employed in highway work zones as an innovative temporary traffic control (TTC) device in the United Stated for many years. The traditional message format on a PCMS is text-based, which has been found to have several limitations in recent studies, such as confusing drivers and delaying their respo
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Communications between high-technology devices in work zones has long been a challenge. The problem is acute in rural areas where there is often little or no existing infrastructure to support wireless communication to the same extent as in urbanized areas. Despite this, there is often a desire to use real-time communications between new technologi
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This research examined the safety and operational benefits of having traffic merge early into the open lane prior to a work zone merge area. A 2007 law in Oklahoma adopted the use of additional “STATE LAW MERGE NOW” static signing in the advance warning areas approximately 1/2-mile upstream from freeway merge areas. Work zones that were continuatio
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The purpose of this project was to study the accuracy and usefulness of the Vaisala Spectro/Cyclo (DST111 and DSC111) pavement condition and temperature sensor suite under real-world conditions. The goal was to compare data collected from the Vaisala sensor suite with data gathered from in situ sensors to determine if the data were accurate.
One of the renewal projects under the Second Strategic Highway Research Program (SHRP 2) explored the potential for broad use of portable spectroscopic devices to fingerprint construction materials commonly used in transportation infrastructure. One of the instruments identified as having potential was a portable X-ray Fluorescence (XRF) instrument
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This Special Crash Investigations report documents the fatal rollover crash of a 2019 Chevrolet Equinox that moved into the lane of a 2016 Honda CR-V. The Chevrolet went out of control, rolled down a dirt embankment and rolled over. The Chevrolet driver was pronounced deceased on-scene and the belted 52-year-old front passenger was hospitalized for
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United States. Department of Transportation. National Highway Traffic Safety Administration
2025-12-01
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A statistical projection of traffic fatalities for the first 9 months of 2025 shows an estimated 27,365 people died in motor vehicle traffic crashes, a decrease of about 6.4 percent compared to the first 9 months of 2024, as shown in Table 1. The third quarter of 2025 represents the 14th consecutive quarterly decline in fatalities beginning with th
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This report documents the repeatability of measuring the radar cross-section of two pedestrian mannequin test surrogates designed to emulate an adult and a child pedestrian. The test methodology discusses using two measurement procedures from the International Organization for Standardization surrogate devices that aided in the calibration offset c
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This report summarizes research conducted to support NHTSA’s response to requirements of the Infrastructure Investment and Jobs Act (IIJA) of 2021 to amend Federal Motor Vehicle Safety Standard No. 108 “to include performance-based standards for vehicle headlamp systems (A) to ensure that headlights are correctly aimed on the road; and (B) requirin
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Tied arch bridges represent a vital component of the nation's infrastructure, valued for their structural efficiency and aesthetic qualities. These bridges rely on arch ribs to transfer vertical loads into horizontal thrusts, which are counteracted by the tie beams (TBs) acting in axial tension. In addition to this axial tension, TBs are also subje
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The project examined the impact of degradations on advanced driver assistance system (ADAS) perception sensor performance. Sensor degradation refers to the gradual decline in a sensor’s performance over time, resulting in deviations from its nominal or expected output. The scope included permanent and semi-permanent cumulative degradations affectin
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Remarks by Frank C. Herringer, Administrator of the Urban Mass Transportation Administration, at the American Transit Association's News Conference in Washington, D.C. on March 21, 1973.
The Safety Edge is a relatively low-cost countermeasure that can be applied in both asphalt and concrete paving operations. The Safety Edge has been promoted as a low-cost countermeasure to reduce the frequency and severity of rural roadway departure crashes. However, there is little information about the actual effectiveness of the Safety Edge in
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Monitoring of the in-field performance of bridges and other structures has become a very valuable tool to the Iowa DOT Office of Bridges and Structures. There simply is no better way to understand how structures react to loadings than by physical monitoring and testing. There are a large number of monitoring tools that are commercially available. O
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Canadian Pacific Railway (CPR) has been a leader in implementation of new friction control technology. Following earlier trials, we report the design, justification, roll out and early results of Total Friction Management (TFM) (GF plus TOR) over all high tonnage lines in Western Canada. Tools and processes needed for implementing TFM over a large
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In 2003, BC Rail and Kelsan Technologies carried out a project to quantify the effect of Top of Rail (TOR) Friction Control on fuel consumption and Greenhouse Gas (GHG) emissions by reducing the curving resistance of a standard 3 piece North American truck. Measurable savings were based on monitoring changes in diesel fuel consumption, as well as m
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The purpose of the work presented has been the development of an explanatory variable that characterizes train handling effects, allowing for the identification of changes in locomotive fuel consumption over a given territory (for example in response to Top of Rail Friction Modifier (TORFM) application) with improved confidence. To generate the exp
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Managing the Top Of Rail (TOR) wheel/rail coefficient of friction, using friction modifiers (FM), has consistently demonstrated significant benefits to the heavy haul industry including fuel/energy savings, wheel & rail wear reduction, and reduced state of stress of the track infrastructure. Traditionally, the preferred method of FM application has
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This paper outlines a new application technology for top of rail (TOR) train mounted friction control, particularly suited for captive freight fleets. The spray application system is mounted on a revenue-generating freight car located immediately behind the trailing locomotive. Compared with locomotive mounted systems [1, 2, 3], the new approach pr
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2025-12-03
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Special Issue - Weekly Motor Fuel Report
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The Gasoline Product Supplied report offers insight on weekly fluctuation of the gasoline product supply, which is an important part of any analysis of construction trends, materials and operating costs associated with highway repair and construction, and changes in traffic volume. These data come directly from the Energy Information Administration
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United States Department of Transportation
Alcazar, Javier
