The project discussed in this report concerned the night use of overhead guide signs, including button and reflectorized copy and all practical combinations of reflectorized and opaque backgrounds. This project was a follow-up effort to the literature review by Gordon.(l) Gordon's review found areas requiring further investigation, including the co
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This study entailed the identification and examination of technologies and a review of the current processes related to the collection and management of motor vehicle traffic accident data. The study identified those technologies that are most promising in terms of improving the quality, accuracy, completeness, and timeliness of the accident data a
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The purpose of this project was to identify, from existing research on warning, regulatory, and symbol signs, where deficiencies in motorists' understanding may pose safety or operational problems and to define acceptable levels of motorists' comprehension. The study developed alternative designs to remedy the identified deficiencies. These propose
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The purpose of this project was to identify, from existing research on warning, regulatory, and symbol signs, where deficiencies in motorists' understanding may pose safety or operational problems and to define acceptable levels of motorists' comprehension. The study developed alternative designs to remedy the identified deficiencies. These propose
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The purpose of this project was to identify, from existing research on warning, regulatory, and symbol signs, where deficiencies in motorists' understanding may pose safety or operational problems and to define acceptable levels of motorists' comprehension. The study developed alternative designs to remedy the identified deficiencies. These propose
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Highway safety is an ongoing concern to the Texas Department of Transportation (TxDOT). As part of its proactive commitment to improving highway safety, TxDOT is moving toward including quantitative safety analyses earlier in the project development process. The objectives of this research project are: (1) the development of safety design guideline
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This project was established to provide a means of conducting limited scope evaluations of numerous traffic control device issues. During the second year of the project, researchers completed assessments of three issues: an extinguishable Left Turn Yield sign, a red border Speed Limit sign, and dew-resistant sheeting. For the extinguishable Left Tu
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This project was established to provide a means of conducting limited scope evaluations of numerous traffic control device issues. During the first year of the study, researchers completed assessments of six issues: dual logo panels in specific service signing, rear-facing beacons for school speed limit sign assemblies, a red border conspicuity tre
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The procedure described below is applicable to clay forming materials such as hardened clay soils, hard pan, shales, etc. It presents a method of preparing a sample of the material so that the grain size distribution can be determined under the most critical conditions.
Characterization of hydrologic processes of a watershed in the context of drainage design requires estimation of specific time-response characteristics. The time-response characteristics of a watershed frequently are represented by two conceptual time parameters, the time of concentration and the time to peak discharge. The study described in this
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This report summarizes the literature review for the Texas Department of Transportation (TxDOT) project 0-4696 "Estimating Timing Parameters of Direct Runoff and Unit Hydrograph for Texas Watersheds.” Chapter 1 summarizes background information of the NRCS (Natural Resources Conservation Service) dimensionless unit hydrograph, which TxDOT is curren
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This study looks at transverse cracking in asphalt pavement from three viewpoints: 1. 3-R crack repair 2. Mix design 3. Maintenance Some possible alternatives are discussed to deter the formation of transverse cracks in new overlays through improved mix design and construction practices, through the use of fabrics and relief layers, and through the
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As part of the Strategic Highway Research Program's (SHRP) Long Term pavement Performance (LTPP) Study, sections of highway are being selected to apply very specific treatments to study various facets of construction (both new and rehabilitated). These projects are referred to as Specific Pavement Studies (SPS). This particular project, on US-62 in
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The objective of the SPS-1 study is to enhance understanding of the strategic factors that influence the performance of flexible pavements. This SPS-1 project addresses factors including drainage, base type and thickness, and asphalt surface thickness as they relate to pavement performance. The experimental design for the SPS-1 experiment is shown
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The objectives of the study were to establish minimal levels of sign luminance for various signing applications and conditions, and to develop a structure for determining sign maintenance priorities. The objectives were addressed via development of a system for maintenance of sign reflectivity with luminance standards embedded in the system. This r
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Truck speed loss on grades reduces highway capacity and increases the risk of accidents. The rational design of a truck climbing lane as a solution to this problem requires means for predicting truck speed changes on grades. Experimental measurements of the speed loss of trucks operating on highways were conducted at 20 sites throughout the country
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The purpose of this study was to determine current motorist compliance to RTOR regulations, develop and field test countermeasures for RTOR pedestrian accidents, and develop improved warrants and guidelines for prohibition of RTOR. Based on data from several U.S. cities, only 3.7 percent of all right turning drivers violate NO TURN ON RED (NTOR) si
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This document describes the Federal Fiscal Year (FFY) 2015 State Planning and Research Work Program for the Oklahoma Department of Transportation (ODOT). This program is prepared and submitted according to provisions of Title 23, United States Code, regulated under 23 CFR Part 420. Part 1 of the work program describes the Strategic Asset and Perfor
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This Manual is a condensation of a Design Guide report entitled, "Human Factors Requirements for Real-Time Motorist Information Displays, Volume 1--Design Guide," written by the Texas Transportation Institute for FHWA. The Manual provides practical guidelines for the development, design and operation of real-time driver displays, both visual and au
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This document describes the Federal Fiscal Year (FFY) 2014 State Planning and Research Work Program for the Oklahoma Department of Transportation (ODOT). This program is prepared and submitted according to provisions of Title 23, United States Code, regulated under 23 CFR Part 420. Part 1 of the work program describes the Planning activities and Pa
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