Aviation News was published from 1961-circa 2002 in the interest of aviation safety and to acquaint readers with the policies and programs of the Federal Aviation Administration (previously the Federal Aviation Agency).
Aviation News was published from 1961-circa 2002 in the interest of aviation safety and to acquaint readers with the policies and programs of the Federal Aviation Administration (previously the Federal Aviation Agency).
Researchers designed a laboratory test sequence to identify the optimum amount of portland type I cement for stabilizing two aggregates, limestone and recycled concrete, typically used in the Houston District. Smectitic compositions identified through mineralogical investigations corresponded with the poor performance of the untreated aggregates in
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The Western Slope Wildlife Prioritization Study (WSWPS) emerged from a commitment to increased collaboration between CDOT and Colorado Parks and Wildlife (CPW) to address wildlife conflicts on roads. The study’s objective involved identifying wildlife-highway conflict areas where targeted mitigation could have the greatest impact on reducing WVCs.
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Due to concerns that the hydrologic regime of the wetland complex in and around Summit Lake Park has been significantly altered by development of State Highway 5 (SH 5), a field study of the hydrology, soils, and vegetation above and below the roadway was initiated in 2018. The objectives of this study are to investigate the natural hydrologic proc
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United States. Department of Transportation. Federal Highway Administration
2025-12-01
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The Federal Highway Administration conducted a safety evaluation of rectangular rapid flashing beacons (RRFBs), including developing crash modification factors (CMFs) and benefit-to-cost (B/C) ratios. The RRFB includes two rapidly-flashed rectangular-shaped yellow indications, each with a light-emitting diode-array based pulsing light source that f
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This research was conducted to examine State and local speed laws, regulations, and current practices for setting speed limits. The information for the study was obtained from a review of the literature and a mail survey of State and local highway officials conducted by a Task Force of the AASHTO Subcommittee on Traffic Engineering. Throughout year
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2026-01-14
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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. Federal Highway Administration. Office of Highway Policy Information
2026-01-07
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Traffic Volume Trends
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Traffic Volume Trends is a monthly report based on hourly traffic count data reported by the States. These data are collected at approximately 5,000 continuous traffic counting locations nationwide and are used to estimate the percent change in traffic for the current month compared with the same month in the previous year. Estimates are re-adjuste
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Colorado Department of Transportation (CDOT) does not have evidence how the Dynamic Cone Penetrometer (DCP) test results correlate to other test methods (say, R-value) for Colorado’s pavement subgrade. Even, the correlation between single-mass, and dual-mass DCP (which are two ways of conducting DCP test) is still unknown. Pavement Mechanistic-Empi
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Some of the hot mix asphalt pavements constructed for CDOT prior to 2016 have demonstrated premature cracking and raveling distress. The appearance of these pavements is reported to be that of pavements which contain lower than desirable asphalt binder content. However, quality control and quality assurance data obtained from these projects indicat
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The recommendation that the mowing height should be 7 inches was confirmed by the research in most situations. This height of mowing provides the best opportunity for mid-seral grasses to be established in the rights-of-way. Mowing at 2 inches will remove stem bases and basal crowns in which carbohydrates are stored and reduce tiller recruitment an
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The Texas Metropolitan Mobility Plan (TMMP) includes estimates of congestion derived from the regional transportation planning models. This report describes modifications to the output statistics to incorporate the effects of freeway entrance ramp metering, freeway incident management, arterial signal coordination and arterial street access managem
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Under a previous study, Texas Transportation Institute (TTI) and the Texas Department of Transportation (TxDOT) worked cooperatively to conceptualize and develop two aesthetically pleasing and crashworthy rail designs. The rails were designated the T77 and F411. Researchers performed and evaluated full-scale crash tests on the new rails in accordan
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The study examined the relationship between a truck driver's driving record in a personal vehicle and in a large truck, with special focus on the value of the personal driving record for predicting future performance in the truck. The study included a literature review, analysis of data, and an expert panel to review the findings. Driver history fi
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To minimize premature failures, the Strategic Highway Research Program (SHRP) proposed binder tests that can identify poorly performing binders. To meet new performance grade specifications, a modifier is typically added to the binder. Occasionally, state highway agencies specify a particular modifier type and modifier content to be included in the
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The work contained in this interim report provides a case study describing the design, construction, initial structural evaluation, and performance predictions of the full-depth perpetual pavement constructed on SH 114 in the Fort Worth District. Based on the research findings, recommended improvements to design and construction practices are propo
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Deployment of 2+1 Road with Barrier in Colorado certainly has potential to improve safety. How much safety benefit to expect, however, is, so far, somewhat uncertain. The Swedish design is widely implemented and has a record of success, so proposed Colorado Design is substantially based on it, with some modifications recommended to better reflect U
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Since 1973, a special category of Federal-aid highway safety funds (Section 203) has been available for safety improvements at railroad-highway grade crossings. These funds are apportioned to each State highway agency annually and are used to pay 90 percent of the cost of improvements at selected crossings. Over the last 13 years, each State has be
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The State Highway 9 (SH 9) Colorado River South Wildlife & Safety Improvement Project installed seven large wildlife crossing structures and 10.4 miles of wildlife exclusion fence between Kremmling and Green Mountain Reservoir in Grand County, Colorado. The project was designed to improve driver safety while providing permeability for wildlife acro
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