A performance assessment and willingness-to-pay (WTP) analysis were conducted of the reversible dynamic toll lanes (DTL) of freeway PR-22 in Puerto Rico. This is the first managed lane facility of its kind in a toll freeway in Puerto Rico. Toll transactions from the year 2019 were used to calculate seven performance measures to assess the impact of
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United States. Department of Transportation. Federal Highway Administration
2000-01-01
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PDF
Nondestructive Evaluation (NDE) technologies that determine the condition of the infrastructure can improve our ability to make important maintenance and safety decisions, and will play a critical role in the future success of the highway system. The FHWA NDE Validation Center (NDEVC) is designed to evaluate the effectiveness of NOE technologies an
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United States. Department of Transportation. Federal Highway Administration
2003-01-01
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PDF
When safety experts worldwide need to review crash data, look at computer models of vehicles, or analyze roadside hardware designs, they rely on the researchers and the resources available at the National Crash Analysis Center (NCAC). As a unique storehouse of safety information and safety expertise throughout the world, NCAC supports the Federal H
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United States. Department of Transportation. Federal Highway Administration
2003-01-01
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PDF
The Bridge Management Information Systems (BMIS) Laboratory identifies and analyzes the causes and trends of deficiencies in the Nation's bridge inventory and develops methods to enhance bridge management practices. Using the National Bridge Inventory (NBI), BMIS provides the Federal Highway Administration (FHWA) and its customers with applications
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United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The Human Centered Systems (HCS) Laboratory aids the design of a safe and efficient roadway infrastructure through the analysis of driver and pedestrian behavior.
The main objective was to provide the outcome in traffic engineering terms that can be used by the TMC, the team needed to translate the traffic congestion recorded into Level of Service (LOS), and traffic density, or occupancy. The team enhanced the algorithm developed in Phase I by following a specific framework and pieces of algorithm to perform
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United States. Department of Transportation. Federal Highway Administration
2002-01-01
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PDF
The Geotechnical Laboratory studies the complex interactions between soil and those structural elements made of steel, concrete, and timber used for bridge foundations and retaining wall systems. New materials, new designs, and new methods of construction are tested and evaluated in both indoor and outdoor environments to determine their acceptabil
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The behavior of two 55 ft. long prestressed, composite steel beam concrete slab bridge units was studied. The type of unit tested is currently used in county road bridge construction, where the use of prefabricated units is especially economical.
In the second phase of the project, the research team continued traffic data collection with unmanned aerial systems (UAS) and dual sensors (RGB and thermal cameras) for roadways under normal operational condition and during incident clearance. The research team conducted a thorough literature review of incident detection methods. Based on the revi
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United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The Traffic Research Laboratory (TReL) is a unique combination of advanced hardware and software systems that can be used by researchers and practicing traffic engineers to assess and evaluate the impact of various combinations of advanced technologies, strategies, and policies prior to field installation. State-of-the-art traffic research and deve
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United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The mission of the Paint and Corrosion Laboratory (PCL) is to provide technical support to the Office of Infrastructure Research and Development to develop and analyze the effectiveness of innovative coatings test procedures while evaluating the durability of new coating systems, especially environmentally compliant materials for the corrosion prot
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United States. Department of Transportation. Federal Highway Administration
2002-01-01
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PDF
Researchers at the Federal Highway Administration's Nondestructive Evaluation (NDE) Laboratory, located at the Turner Fairbank Highway Research Center, develop and test NDE technologies to assess the condition of highway bridges. This assessment includes evaluating current technologies and developing new tools that will advance the practice of brid
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United States. Department of Transportation. Federal Highway Administration. Office of Operations
2002-02-01
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PDF
The Office of Operations R&D is making major contributions to assist FHWA in meeting its mobility, safety, and security goals through completed or planned products and activities with the following strategies: Implementing an Integrated Intelligent Transportation System (ITS)Infrastructure; Focusing on Weather, Security, and Lifesaving Technologies
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United States. Department of Transportation. Federal Highway Administration
2002-01-01
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PDF
The Bituminous Mixtures Laboratory (Mix Lab) develops and improves bituminous mixture design technology and performance-based tests, and evaluates aggregates, binders, additives, and new materials. The laboratory also provides the Federal Highway Administration (FHWA) and its customers with an unbiased evaluation of mixtures and test procedures.
United States. Department of Transportation. Federal Highway Administration
2002-01-01
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PDF
The SIMAP Laboratory provides FHWA and its customers with applications of diverse cutting-edge technologies that provide a complete description and understanding of pavement performance, including design and construction, and properties of asphalt pavements with long service lives. This highway research lab actively focuses on analysis of asphalt s
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United States. Department of Transportation. Federal Highway Administration
2002-01-01
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PDF
The Binder Rheology Laboratory conducts Superpave® performance-based binder (asphalt) specification testing, research and development, and advanced rheological research in binders (asphalts, modified asphalts, and mastics [binder and rock dust]) to improve the durability, longevity, quality, and life-cycle cost of asphalt pavements. One way to unde
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This is a listing pertaining to the status of the research evaluation of products and equipment which may possibly be used in highway construction or maintenance by the Oklahoma Department of Transportation. Products and equipment are continually being evaluated and implemented into use by the Department. The status of their evaluation therefore is
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The Urban Mobility Report (UMR) has been providing information on urban congestion levels in the U.S. for more than three decades. The UMR uses private-sector crowdsourced travel speed data from INRIX® combined with traditional public-agency roadway inventory data to measure mobility conditions. The current UMR statistics describe overall congestio
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This report was written to address the U.S. aviation industry’s need to increase the efficiency of qualification and certification (Q&C) of process-intensive aviation components through the maturation and adoption of computational materials (CM) methods. A key challenge in the introduction of these CM approaches is overcoming the valley of death, w
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This study consisted of a hydrographic survey and determined maximum scour around the piers at eighteen selected bridges on the Cimarron, Arkansas, and Caney Rivers. The survey was performed soon after the 50- to 100-year-frequency flood in October, 1986. It was determined from the survey that maximum scour varied from 0.60 to 18 feet with depth of
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This research introduces practical optimization model for implementing ride-sharing in taxi services and studies the effects of ride-sharing on the congestion status through the case study of Chicago. Ride-sharing combines trips into one ride-shared trip with the objective of maximizing the total mileage saving. This research proposes a multi-stage
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This study calibrated the predictive models for conventional intersections in the Highway Safety Manual (HSM) second edition draft to account for local conditions in Virginia. The calibration ensures that predictions made with the HSM safety performance functions accurately reflect the crash experience, driver population, and environmental characte
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The road history projects undertaken by the Virginia Transportation Research Council establish the feasibility of studies of early road networks and their use in the environmental review process. These projects, by gathering and publishing the early road orders of the vast parent counties and other significant areas, also lay the foundation for add
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A unique network tied-arch bridge with free-standing arches was designed to carry 2nd Avenue traffic over Interstate (I-94) in Detroit, Michigan. This 245-ft-long, 96.5-ft-wide bridge, skewed at 18 degrees, is the first skewed, unbraced network arch bridge constructed in the United States. The superstructure frame was erected off-site at a bridge s
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This is the final report for the use of emulsified asphalt in a relatively new process called "Ralumac Micro Surfacing". This process was developed in Germany and was first used in the United States in late 1980. In 1982, personnel from the Oklahoma Department of Transportation (ODOT) Observed projects in another state and proposed a project in Okl
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This program was initiated as the result of the findings of the WMATA wheel wear/track wear study. Because of the close wheel/track tolerance and flange profile, WMATA noted a wear rate in both wheel and track which was several times higher than anticipated. Because earlier studies of a steerable truck concept had never been completed, WMATA reques
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Current Federal Highway Administration (FHWA) models were reviewed and the key mathematical formulations important to roadside hardware were defined. The review included identification of the important handling models as well as finite element based formulations. An outline for a single common user interface that organizes and automates data commun
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This Policy will ensure that Federal Highway Administration staff and individuals that make substantial intellectual contributions to scientific and technical products such as, but not limited to, the American Concrete Institute Journals, American Journal of Physics, American Society of Civil Engineers, Institute of Electrical and Electronics Engin
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Twelve skewed elastomeric expansion bridge bearings were supplied by the Oklahoma Department of Transportation. To evaluate the performance of these skewed bearings, the following six phases of testing were conducted on each of the twelve bearings: I. Shear and compressive stiffness tests, II. Fatigue cycles representing 50 years of service with pa
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Twelve skewed elastomeric expansion bridge bearings were supplied by the Oklahoma Department of Transportation. To evaluate the performance of these skewed bearings, the following six phases of testing were conducted on each of the twelve bearings: I. Shear and compressive stiffness tests, II. Fatigue cycles representing 50 years of service with pa
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The information contained within this report addresses: 1) implementation of roadside development and erosion control results, 2) herbicide evaluation for the effective and economical eradication of undesirable roadside vegetation, 3) evaluation of species and cultural practices for ground cover establishment, and 4) fertilizer evaluations for main
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This study investigates the field implementation of shale stabilization on an experimental project. A number of test sections were set on the south bound lane of U.S. Highway 77, north of Ponca City, Kay County, Oklahoma. To compare the effectiveness of various stabilizing agents, the base courses of these test sections were stabilized with cement
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A study was conducted in Oklahoma in 1983 to determine the performance of fabric form mats filled with different proportions of fly ash cement grout mixtures. They were used to repair a 285 ft long severely eroded ditch. The mat was filled with three different mixtures. They were composed of 100 percent cement, a 50-50 mixture of fly ash and cement
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This publication consists of a listing of experimental products and equipment that are being considered or evaluated by the Oklahoma Department of Transportation, other transportation departments, or other agencies. The listing is continuously updated as new information is received. A status of the evaluation is indicated for each item, showing the
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The October 1986 flood of the Cimarron River resulted in severe scour around piers of eight overflow structures of the 1-35 bridge. A major portion of the flood I passed through these structures resulting in a high velocity of flow. Furthermore, the bridge is located on a meander, and that leads to a skewed, flow in the flood plain. This fact cause
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Two ice warning systems were installed on the Interstate highway system in the Oklahoma City area. A Boschung Company, Inc. Ice Early Warning System was installed on three elevated structures or bridges. A Surface Systems Inc. SCAN System was installed on one of the structures. The systems were evaluated for two winter seasons. The primary objecti.
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This publication consists of a listing of experimental products and equipment that are being considered or evaluated by the Oklahoma Department of Transportation, other transportation departments, or other agencies. The listing is continuously updated as new information is received. A status of the evaluation is indicated for each item, showing the
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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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Hurricane Paine, extending across the Central Plains of the United States, caused flooding of unprecedented proportions in the Caney River. This storm produced a rainfall varying from 20 to 30 inches in Oklahoma during September 29 through October 4, 1986.
Hurricane Paine, extending across the Central Plains of the United States, caused flooding of unprecedented proportions in the Caney River. This storm produced a rainfall varying from 20 to 30 inches in Oklahoma during September 29 through October 4, 1986.
The objective was to determine the extent that transient visual adaptation (TVA) affects drivers' detection of targets along partially lighted freeway interchanges. The study expanded a preliminary task on TVA described in publication FHWA-RD-88-223. Twenty-five subjects drove 10 trials on an entrance and an exit ramp. Lighting was manipulated to p
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A 55 ft. long prestressed, composite steel girder-concrete slab bridge unit was tested to ultimate load. The unit had previously undergone a series of tests including sustained loading, fatigue loading, and static loading to first yield. The 54 ft., simply supported span was subjected to static loads applied at points 20 ft. from the supports. Vert
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To evaluate the causes of bridge approach settlement a survey of 758 bridge approaches in seventy-seven counties of Oklahoma was conducted. In this survey, data related to the following items were collected: (i) bridge, abutment, approach, and slope protection structure; (ii) embankment material. Information related to the construction and maintena
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To evaluate the causes of bridge approach settlement a survey of 758 bridge approaches in seventy-seven counties of Oklahoma was conducted. In this survey, data related to the following items were collected: (i) bridge, abutment, approach, and slope protection structure; (ii) embankment material. Information related to the construction and maintena
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The research team performed a literature review to determine the current state of the practice and emerging approaches on the following pavement widening topics: Pre-design pavement evaluation, sampling, and testing.• Pavement layer and cross-section design practices.• Material performance, availability, and selection practices.• Plans, specificati
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Bank stabilization and protection from flood ravages have been a continuing problem in Oklahoma as well as in the surrounding states for a very long time. Bridges and hydraulic structures are situated at river sites where the river must become mature and conform to a desirable or controlled regime. In Oklahoma, several large rivers and streams flow
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Premature pavement failures have occurred on several widening projects, including shoulder widenings, conversion of two-lane roadways to Super 2 sections, and other safety enhancements. Repairing these early failures is time-consuming, expensive, disrupts traffic, and poses safety hazards. Key contributing factors include poor-quality materials, po
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This study consisted of a hydrographic survey and determined maximum scour around the piers at eighteen selected bridges on the Cimarron, Arkansas, and Caney Rivers. The survey was performed soon after the 50- to 100-year-frequency flood in October, 1986. It was determined from the survey that maximum scour varied from 0.60 to 18 ft with depth of f
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The cause of diaphragm cracking on an interstate highway bridge was investigated. The investigation consisted of load-testing the bridge, performing a computer-aided analysis of the bridge superstructure and specific components, measuring the chemical and physical properties of the diaphragm steel, and performing fatigue tests on simulated diaphrag
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This publication consists of a listing of experimental products and equipment that are being considered or evaluated by the Oklahoma Department of Transportation, other transportation departments, or other agencies. The listing is continuously updated as new information is received. A status of the evaluation is indicated for each item, showing the
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United States Department of Transportation
Colucci-Ríos, Benjamín