The research team reviewed past practices for barrier delineation and evaluated barrier striping at several locations in Texas. Five existing sites with barrier striping were analyzed using crash data. In addition, striping was installed at a high-crash location for before-and-after evaluation. The study considered crash history, roadway and traffi
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Barrier striping is a roadway safety countermeasure designed to enhance driver awareness of concrete barriers, particularly under adverse weather and low-visibility conditions. This study evaluated the short- and long-term safety effectiveness of retroreflective barrier striping across multiple sites in Texas. The research involved a comprehensive
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Across the United States and around the world, cities are increasingly reconsidering, and often repealing, minimum parking requirements. They are doing so to align their parking policy with their housing, climate, and mobility goals. While minimums can help increase parking availability and prevent curb parking from becoming overcrowded, they can a
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The plastics industry has been actively exploring new end-market opportunities for the more than 35 million tons of waste plastics generated annually. The use of recycled WP in asphalt presents an opportunity to improve pavement performance while reducing the growing amount of WP being landfilled or released into the environment. However, the use o
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This study developed and evaluated a 34-in.-tall Nebraska Department of Transportation (NDOT) thrie-beam approach guardrail transition (AGT) with an increased span between the concrete buttress end and the first transition post. The objective was to accommodate a wide range of common obstructions near bridge ends, including abutments, wing walls, d
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Five coating systems were evaluated for use over corroded structural steel surfaces. The coatings were applied over both clean (non-corroded) steel panels and panels pre-corroded in a salt fog chamber. The coated panels were then exposed for 50 days in the salt fog chamber. Visual observations were made on a daily basis to obtain data on blister si
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Transverse cracking of asphalt pavements is a costly pavement distress occurring in states that experience cold/freezing temperatures during the winter months. The cracks are caused by low temperature-induced tensile stresses that exceed the tensile strength of the pavement material. The majority of these cracks occur in the transverse direction re
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During the past 20 years, the Oklahoma Department of Transportation (ODOT) has constructed over 450 lane miles of Continuously Reinforced Concrete Pavement (CRCP) on its interstate and U.S. highway system. Throughout that time, few changes have been made to the original CRCP design.
This study evaluated the “Fully Softened Shear Strength (FSSS)” of soils in Nebraska based on a revised Cone Penetration Test(CPT) method. FSSS is a unique strength condition that soils show substantially reduced strength during rainy seasons, eventually causing failure of slopes and other structures. The revised CPT was adapted to inject water at
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Much of the crushed limestone aggregate produced in the Oklahoma region is susceptible to freeze-thaw action and can result in pop-outs and D-cracking in concrete. Four series of tests involving over 120 batches of concrete were conducted to establish if adjustment of certain mix parameters would mitigate the detrimental properties of the aggregate
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The Oklahoma Department of Transportation (ODOT) has been using .High Density Portland Cement (HDPC) overlays on reconstruction of bridge decks since 1977. At the time of introduction, the HDPC (Iowa method) was considered the best method to prevent or minimize bridge deck deterioration. Although many of the overlays have performed well, some have
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To effectively gauge the advancements in Emerging Metallic Structures Technologies (EMST), a collaborative effort involving Arconic, Embraer, the National Institute for Aviation Research (NIAR) and the Federal Aviation Administration (FAA) has been undertaken. This collaboration focuses on the development of a full-scale fuselage structure test art
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Five coating systems were evaluated for use over corroded structural steel surfaces. The coatings were applied over both clean (non-corroded) steel panels and panels pre-corroded in a salt fog chamber. The coated panels were then exposed for 50 days in the salt fog chamber. Visual observations were made on a daily basis to obtain data on blister si
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The overall objective of this project was to evaluate the relative adequacy of the engineering grade, super-engineering grade, and high-intensity grade sheetings when used on traffic control devices at construction work zones. Evaluation criteria included driver visibility needs, durability and economics, and other practical considerations. To meet
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Malfunctions of the AHS vehicle, wayside electronics, roadway, and driver sub-systems along with possible methods of detecting the malfunctions are identified. Possible strategies to manage the malfunctions are proposed. Measures of effectiveness by which the strategies may be evaluated are defined. A method of using the measures of effectiveness i
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The Illinois Department of Transportation (IDOT) began conducting pavement performance monitoring surveys on mechanistic-empirical designed pavements in 1986. These surveys and analyses provide the necessary data to verify and validate the design procedures and life-cycle cost models used in the pavement selection process. The pavement distress sur
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