The research aimed to evaluate how screw anchors actually perform in real FDOT conditions, understand why the current ACI design approach is conservative, and develop improved FDOT design guidelines that safely allow screw anchors to be used more widely, without unnecessary restrictions.
The AASHTO Committee on Bridges and Structures has approved the updated ACI CODE-318, 2019 edition (ACI CODE 318-19,) into the 10th edition of the AASHTO LRFD Bridge Design Specifications. This would allow the adoption of screw anchor designs that benefit from rapid, reliable, and simplified installation procedures. However, the ACI CODE approach h
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Large scale areas were established to demonstrate implementation of research findings. These included: (1) johnsongrass control, (2) willow control, (3) bindweed control, (4) broadleaf weed control, (5) sandbur control, (6) seeding Plains bluestem, and (7) planting ground covers other than grass. As a result, the use of herbicides for roadside main
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This report discusses a single bituminous surface treatment using an asphalt-rubber binder and pre-coated aggregate over a bleeding and cracked asphalt concrete highway. Tests and evaluations include: a pavement condition rating, core sample descriptions, subgrade soils, pavement deflection measurements and pavement serviceability. An asphalt-rubbe
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The main objective of this research was to identify and quantify the factors that influence resistivity measurements in concrete samples, comparing field- and laboratory-fabricated specimens (per AASHTO T 358 and AASHTO TP 119).
This report addresses in-flight recorded data from eight BAe-146s and eight RJ-85s flown in support of the United State Forest Service aerial firefighting operations. All flight data was recorded at 32 Hz by IONode100 units supported by Latitude Technologies, Corp. All data was examined for integrity, and anomalies and inaccuracies were identified
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The objective of this report is to evaluate the feasibility and benefit of utilizing asphalt pavement hot recycling in Oklahoma. The work began in April,1980 and lasted through June 1980. The 8 1/2 mile (13.6 km) project was located on I-40 in Caddo County. _The project involved cold milling the top one inch (25 mm) of roadway. A non-woven polyprop
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Before specifications can be developed for use of electrical resistivity in quality control programs, potential differences between field- and laboratory-made samples must be quantified. The present research was conducted to provide a better understanding of the effect of each of the factors studied in the variability observed between field-fabrica
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The project aimed to evaluate the impact of four strategies designed to improve the durability of FC-5 mixtures: employing a 9.5-mm nominal maximum aggregate size (NMAS) gradation; using a high polymer (HP) modified binder in the mixture; assessing the effectiveness of a 12.5-mm stone matrix asphalt (SMA); and exploring an alternative friction cour
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The Florida Department of Transportation (FDOT) uses a 12.5-mm nominal maximum aggregate size (NMAS) open-graded friction course (OGFC) called FC-5 on multi-lane roads to enhance safety. However, FC-5 is susceptible to premature raveling on high-speed suburban roads due to increased lateral turning, braking and accelerating stresses. To address thi
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Cathodic protection of steel in portland cement concrete requires information concerning several different areas. This report describes studies which were pointed toward developing an understanding of several of these. A study of making an asphaltic concrete conductive was accomplished using coke breeze mixed with asphalt and aggregate. Mixes conta
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The objective of this report is to study non-woven Thermoplastic fiber fabrics and their effects in eliminating and diminishing reflective cracking in asphalt concrete overlays. Two fabrics, namely Petromat and Mirafi 140, were placed on an existing Interstate highway. The road was overlayed with 1/2 inches of Type C asphalt concrete and 3/4 inches
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This study is an attempt to determine from laboratory tests the shrink or swell characteristics of excavated pedological soils. Twenty-six benchmark soils of various particle size classes were selected for study. It was found that sandy loam soils shrink the most. They shrink about 14 percent. Clay soils may not shrink at all. Standard Proctor dens
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The primary objectives of this research were to: 1) develop an efficient and accurate method for bridge repair and replacement cost estimating; and 2) implement the developed method in a cost estimation worksheet; 3) provide an automated system that allows periodic updating of costs. To accomplish these objectives, several modeling approaches were
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This project leverages connected intelligent transportation technologies to enhance the safety of vulnerable road users (VRUs) within evolving urban road systems. This project targets three fundamental barriers: the lack of high-fidelity experimental platforms, localization failures in GNSS-denied areas, and insufficient trajectory prediction for h
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Researchers at the Texas A&M Transportation Institute (TTI) designed and tested a Manual for Assessing Safety Hardware (MASH) Test Level 3 (TL-3) compliant guardrail transition system (hereafter referred to as Transition) that enables transitioning and terminating the ends of the Texas Department of Transportation MASH TL-4 guardrail system with MA
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The scope of this research was to the use of Tapes for research documentation and training within the Oklahoma Department of Transportation. Equipment that was acquired in this project consists of a distribution system, dubbing system, a field production system, and system. dubbing allows copies from one tape to another as well as copying from 3/4"
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This report has been prepared to inform the Oklahoma Department of Transportation of the progress on the project: Conversion of Oklahoma Waste Coal into Road Asphalt, as well as to provide enough information so that co-workers at the ODOT can readily duplicate the described procedures. Part I provides background material which introduces the techni
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Cathodic protection of steel in portland cement concrete requires information concerning several different areas. This report describes studies which were pointed toward developing an understanding of several of these. A study of making an asphaltic concrete conductive was accomplished using coke breeze mixed with asphalt and aggregate. Mixes conta
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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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During plastic deformation of metals only a portion of the plastic work done on the material is expended to modify its physical properties while the remaining energy is converted to heat. The associated rise in temperature during deformation can affect the mechanical response of the material (e.g. strain hardening, thermal softening, precipitating
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Composite materials are now beginning to provide uses hitherto reserved for metals in structural systems such as airframes and engine containment systems, wraps for repair and rehabilitation, and ballistic/blast mitigation systems. These structural systems are often subjected to impact loads and there is a pressing need for accurate prediction of d
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“Major transit stop”: how these three words are defined determines what can be built where, throughout much of California. In order to address housing supply constraints, the state legislature has enacted a number of laws that streamline approval and remove zoning constraints in areas close to high-quality transit. But what, exactly, is a “major tr
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The relatively high supply of moisture in bridge deck fascias often causes them to deteriorate more quickly than other portions of the bridge. This causes the fascia concrete to become de-bonded from the reinforcement and fall, posing a safety hazard to traffic or pedestrians beneath the bridge. A related concern is that the deterioration of the co
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This study evaluates the implementation of electronic enforcement. A review of electronic enforcement technology was conducted, and best practices of electronic enforcement were documented. Using inspection and violation data, a statewide and site-specific analysis were conducted to determine violations that occurred most often. Upon identification
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A wind power demonstration program was carried out to assess the potential of wind power energy for highway uses in Oklahoma. A secondary purpose of the program was to provide information for the public on the use of wind power for more general applications. Winds peed measuring equipment was installed at the Erick Information Center along I-40 in
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This research investigates the impact of cross-frame detailing on the behavior of horizontally curved and skewed steel I-girder bridges. An analysis procedure based on three-dimensional (3D) finite element (FE) method is developed to accurately capture the complex behavior of steel girder bridges with various cross-frame detailing methods. By follo
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United States. Department of Transportation. Federal Highway Administration
1997-01-01
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PDF
This HPC bridge project is being conducted by the Georgia Department of Transportation (GADOT). Funding for this project comes from GADOT, FHWA, and 10 states that pooled their research funds. The project is being conducted in cooperation with the Georgia Institute of Technology. The objective is to design, construct, test and evaluate a highway br
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Qualitative studies were undertaken by having group. discussions and one-on-one interview sessions with all engineers working for the Oahu District. Among the positive findings are that there is adequate team work, engineers are motivated by the nature of work and challenges posed, engineers wish to enhance their knowledge, and job responsibilities
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To assess the technological maturity of data fusion and artificial intelligence (AI) capabilities of intersection safety systems (ISS), the U.S. DOT designed the Intersection Safety Challenge Stage 1B: System Assessment and Virtual Testing as a data science competition. For this data science competition, the U.S. DOT collected and provided real-wor
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In response to growing concerns regarding the safety of vulnerable road users at intersections, the U.S. Department of Transportation launched the Intersection Safety Challenge in Spring 2023 with the vision to transform intersection safety through the development of innovative intersection safety systems that can identify, predict, and mitigate un
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This Traffic Tech briefly summarizes the results of process and outcome evaluations conducted for the Buckle Up Phone Down program implemented in two demonstration cities. The Traffic Tech additionally includes a summary of the implementation of the demonstration programs.
The National Transportation Library (NTL) is a born-digital library which collects Government-funded transportation research and other materials, provides reference services to the public, coordinates the National Transportation Knowledge Network, and supports BTS transportation statistical data products. Created by the Transportation Equity Act fo
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This report covers the results of Phases II and III of the research project. Based upon the findings of this study, recommendations were made for possible improvement of the currently used design and management procedures. Specific recommendations were made for improved material specifications to avoid stripping in the pavement structure as this wa
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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 goal of this project is to change that paradigm by developing a training program that educates MPO board members on the potential for enacting system-wide and corridor-level congestion management and reduction strategies through the federally required metropolitan transportation planning process. More specific goals of this project include aidi
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Metropolitan Planning Organization (MPO) board members are responsible for establishing a long-range transportation vision for their metropolitan area and for making a variety of other significant transportation planning and programming decisions. These decisions have noteworthy and long-lasting impacts on the character of their communities, includ
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This report describes the installation and monitoring of three test sections to evaluate dynamic compaction as it was applied as a foundation treatment for the approach fills of an interchange on the Gilcrease Expressway (SH 11) in north central Tulsa. The test sections were monitored to assess the performance of dynamic compaction and to provide t
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Standard thermoplastic traffic marking stripe was compared with 3M "STAMARK" Brand 5730 plastic marking tape. Both products were placed on two new PCC pavement projects and evaluated over two years. The "STAMARK" was found to be more expensive, easier to place, just as durable, but less reflective at night than standard thermoplastic stripe.
This report describes the performance of alkyltrialkoxysilane chemical products and their ability to protect bridge structures from moisture, chloride ingression, and corrosion of reinforcing steel. As a result of the evaluation, the following recommendations are made: (1) The application of silane should be used to protect bridge structures from m
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2026-03-04
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Special Issue - Weekly Motor Fuel Report
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PDF
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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Aggregate-fly ash mixes consisting of fine aggregate bases (FAB), coarse aggregate bases (CAB) and Class C fly ash additions of 15, 25 and 35% were tested in compressive and flexural strength for curing periods of up to six months. X-ray diffraction (XRD) was employed to study the mineralogical composition of the mixes and identify the fly ash hydr
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United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The Photometric and Visibility Laboratory (PVL) enables researchers to evaluate the photometric and colorimetric properties of signing and marking materials, including fluorescent and retroreflective materials. Studies of human-centered systems related to visibility issues are also performed in this laboratory.
United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The primary mission of the Structures Laboratory is to conduct experimental studies to determine the behavior of bridge components and full-size bridges. Data from these studies are used to improve the national bridge design specifications and to improve the safety, reliability, and cost-effectiveness of bridge construction in the United States. Th
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United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The Highway Safety Information System (HSIS) Laboratory offers value to FHWA's Research and Development program, to other offices within FHWA and DOT, to the safety research community in general, arid to State and local engineers/planners. The purpose of the lab is to operate and maintain HSIS, to conduct research to support FHWA's focus areas, and
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United States. Department of Transportation. Federal Highway Administration
2001-01-01
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PDF
The Saxton Highway Electronics Laboratory (SHEL) started as a small electrical repair shop. Today, it is a modern design and fabrication facility, consisting of a large three-bay vehicle preparation laboratory, model shop, test and storage area, and the main electronics laboratory. The mission of the Highway Electronics Laboratory is to provide ele
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2001-08-01
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PDF
To guide our Business and Performance Plan, the RD&T Leadership Council has a vision to conductresearch and provide products and services that are essential, indispensable, and connected to our customers and partners. We are committed to continuing our quality journey; to initiating improvements in programs, processes, and the quality of work life;
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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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