The safety analysis of intersections where both routes are two-lane roads did not show curvature to have a significant impact on safety in terms of crash frequency or severity. However, this result is unclear and may be partly due to randomness as the sample was relatively small. Curvature does appear to be a significant factor in the case where th
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In recent years, the State of Indiana has built a number of intersections where one or both of the roads are located on curves. The AASHTO Policy on Geometric Design of Highways and Streets recommends that in such cases “the alignment should be as straight and the gradient as flat as practical.” This wording, consistent with Part V of the Indiana D
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The research report includes a stand-alone document that provides the Indiana values of capacity parameters and an equation to calculate the Peak Hour Factor. The local values are tabulated in a convenient format and can be used in capacity and delay predictions with the Highway Capacity Software, Synchro, and CORSIM.
The effect of elongational flow on polymer degradation has been studied by forcing AMK through metal screens and packed tubes at high velocities. Effects of screen size, bead size, and tube length on degrader power have been determined. At a specific power of 15 kWs/l (30 HP at 10,000 lb/hr), AMK exhibits filtration and ignition properties similar
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The pressure modeling technique is used to study fire spread under five different ceiling materials and analytical and numerical techniques are used to compute thermal radiation to floor level from the resultant layer of hot gases near the ceiling. In the physical modeling part of the study, measurements are obtained at one atmosphere (full-scale)
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The objective of this project is to test a new Bendix Microwave Landing System (MLS) Service Test and Evaluation Program (STEP) receiver through comparative bench, instrumented van, and flight tests with an existing Bendix Phase III MLS receiver. Test results will provide performance data for software evaluation before the resident software is fina
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The purpose of the test flight was to collect signal level data radiated from Very High Frequency communications antennas located at the Washington National Airport (DCA). The data was to provide information on the coverage at a range of 40 nautical miles (nmi) and at 8,000 feet mean sea level (m.s.l.) and all approaches and departures of the airpo
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As costs rise in general aviation, many private pilots are forced to reduce the rates at which they fly, both during training and after certification, in order to spread out expenses. This report describes the results of the first phase of a two- and one-half-year study designed to study the impact on pilot performance of reductions in the rates at
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All of the methods for predicting traffic conditions at intersections provide default values for saturation flow rates and their adjustment factors, lost times, and other parameters. Because these parameters are difficult to measure, the use of the default values is a common practice, and it can cause significant bias in the results if the actual l
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This project was initiated to develop a quality control program for the Indiana Department of Transportation (INDOT) to improve the accuracy of the data produced from the WIM system. The quality control program provides a mechanism for assessing the accuracy of vehicle classification, weight, speed, and axle spacing data and monitoring it over time
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Temperature-induced curling and moisture-driven warping continually reshape jointed concrete pavements (JCP), altering wheel-path profiles and affecting the International Roughness Index (IRI). This report presents an integrated framework combining finite element method (FEM) analyses, artificial neural networks (ANNs), and IRI modeling to isolate
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For the past two decades, weigh-in-motion (WIM) sensors have been used in the United States to collect vehicle weight data for designing pavements and monitoring their performance. The use of these sensors is now being expanded for enforcement purposes to provide virtual weigh stations for screening vehicles in traffic streams for overweight violat
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Two skewed (around 45°) two-span continuous bridges with stub abutments or integral abutments were monitored in the field during construction and after the bridges were in service. The goal was to establish a comprehensive understanding of load distribution in skewed steel I-girder bridges and to potentially refine their analysis and design procedu
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The purpose of this study was to provide computer modeled glide slope performance data for several candidate locations of the ILS glide slope which will service Runway 30L at Lambert-St. Louis International Airport, St. Louis, Missouri.
This report 1S an index of all technical reports which were assigned NA numbers and published by NAFEC during the period 1972 through 1977. Entries are arranged by NA number and include titles, authors and full abstracts. Separate sections contain indexes by subject, author, and RD number.
An evaluation was made on the effects of using antimisting kerosene (AMK) on the performance of the components from the fuel system and the combustor of a current in-service JT8D aircraft engine. The objectives were to identify problems associated with using antimisting kerosene and to determine the extent of shearing or degradation required to all
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This report contains the results of a pi lot study accomplished to demonstrate the ability to determine the magnitude of software reliability encountered in large-scale computer-based equipment. The engineering model of the Discrete Address Beacon System (DABS) currently undergoing development was used as the subject. Based on software failure and
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The objective of Automatic Traffic Advisory and Resolution Service (ATARS) hardware timing analysis is to provide sufficient information on the execution time characteristics of ATARS to: (1) permit prospective contractors bidding on an ATARS request for proposals to realistically estimate the size of the system they are proposing, and (2) to provi
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Version 3 of the Dayton Aircraft cabin Fire Model (DACFIR) has been created as a refinement and generalization of earlier mathematical models for the computer simulation of fire growth in the cabin of a commercial transport airplane. The model uses data from laboratory tests on the cabin furnishing materials and a zone (control volume) representati
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Version 3 of the Dayton Aircraft Cabin Fire Model (DACFIR) has been created as a refinement and generalization of earlier mathematical models for the computer simulation of fire growth in the cabin of a commercial transport airplane. The model uses data from laboratory tests on the cabin furnishing materials and a zone (control volume) representati
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