The objectives of this research study were to: (1) assess whether detailed fluid structure interaction (FSI) modeling can inform evaluation of rock riprap movement for both the analysis of existing riprap aprons and for the design of new riprap aprons; and (2) develop recommendations for the design, installation, and monitoring of riprap aprons at
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The Post Hurricane Sandy Transportation Resilience Study in New York-New Jersey-Connecticut provides an assessment of the metropolitan region transportation system’s resilience to climate, sea level rise and extreme weather. The study leverages lessons learned from Hurricane Sandy and other recent events, as well as future climate projections, to i
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Transportation systems management and operations, or TSMO, encompasses a broad set of strategies that aim to optimize the safe, efficient, and reliable use of existing and planned transportation infrastructure for all modes. TSMO is undertaken from a systems perspective, which means that these strategies are coordinated with related strategies and
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The purpose of this guidance document is to provide a fundamental explanation of the "decision support system" (DSS) concept and the relationship of DSS systems and business rules to the integrated corridor management (ICM) community. The document will provide examples and background within and beyond transportation, as well as a clearly organized
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From the start of the Long-Term Pavement Performance (LTPP) Program, the longitudinal profiles along the two wheelpaths at test sections have been collected using an inertial profiler. In December 1996, starting with the K.J. Law T-6600 inertial profiler, all profilers used in the LTPP Program have collected profile data along the center of the lan
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United States. Federal Highway Administration. Road Weather Management Program
2017-10-01
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For the past 10 years, the Road Weather Management Program (RWMP) has periodically evaluated its effectiveness in helping improve the transportation system's performance during adverse weather using sources that include program records, literature reviews, Internet searches, and State DOT surveys.1 To date, four assessments have been conducted and
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Thin concrete overlays have been successfully used in the United States for extending the life of existing concrete, asphalt, or composite pavements. These overlays can accommodate a variety of needs, such as extending performance lives by as much as 15 to 20 years, meeting rapid construction requirements, and conforming to any specific traffic man
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This Manual provides four design examples illustrating the application of the strut-and-tie method for a variety of structural configurations, including a simply-supported deep beam, a cantilever bent cap, an inverted-tee moment frame straddle bent cap, and a drilled shaft footing. Each design example is based on the 8th Edition of the AASHTO LRFD
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This is one of nine engineering case studies conducted under the Transportation Engineering Approaches to Climate Resiliency (TEACR) Project. This case study focused on the impacts of wildfire and precipitation on the performance of a highway stream crossing.
A public-private partnership is an agreement between a government agency and non-government organization to work together to accomplish a goal that benefits both the taxpaying public and the private partner. The agreement between the parties must specify the intended use of the CMAQ funding, the roles and responsibilities of the participants, any c
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The Federal Highways Administration (FHWA) sponsors a Technical Assistance (TA) effort to support states in applying Context Sensitive Solutions (CSS) to challenges they face in the transportation sector. Each state participating in the TA effort is invited to identify one issue to tackle using a CSS approach, with FHWA assistance. Participating st
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Learning in Progress, NHI's quarterly newsletter, provides updates on new course launches, upcoming Web conference seminars, training programs and events, and NHI policy changes.
United States. Department of Transportation. Federal Highway Administration. Office of Safety
2017-10-01
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A High Friction Surface Treatment is a cost-effective safety countermeasure in which a polishresistant aggregate such as calcined (i.e., heat treated) bauxite aggregate is bonded to the pavement surface using a polymer resin binder, significantly enhancing skid resistance and reducing crashes.
United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2017-10-01
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On a monthly basis, each State is required to report to the Federal Highway Administration (FHWA), the amount of gallons taxed by that state. This data is analyzed and compiled by FHWA staff. The data on the amount of on-highway fuel use for each State is then used to attribute federal revenue to each State. Yearly, the FHWA, Office of Policy, prov
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This report synthesizes key findings and trends from the 2017 Statewide Long-Range Transportation Plan (SLRTP) Database, which represents key observations identified through a review of all 52 SLRTPs and Statewide Transportation Improvement Programs (STIPs) published as of December 31, 2016. The research analyzed SLTRPs and STIPs to provide example
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State and local governments can use CMAQ funding to support efforts to meet National Ambient Air Quality Standards (NAAQS) under the Clean Air Act (CAA) in both nonattainment and maintenance areas for carbon monoxide (CO), particulate matter (PM) and ozone (O3 ). Nonattainment areas are those where air pollution levels exceed NAAQS. Maintenance are
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This document presents the user guide for the Long-Term Pavement Performance (LTPP) Web-based tool used to select asphalt binders. LTPPBind Online was developed to help State transportation departments select the most suitable performance-grade binder for a particular site based on the American Association of State and Highway Transportation Offici
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The rehabilitation and reconstruction of existing highway pavements require the optimization of the construction operations. One important aspect of this is to provide defined and controlled traffic patterns that ensure the safety of both the traveling public and the work crews. Effective work zone traffic management (WZTM) is a critical part of an
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