The US Transportation Collection consists of documents from across all transportation modes with specific focus on research reports from US DOT, state DOTs, and other transportation organizations.
Bookmark this collection: https://rosap.ntl.bts.gov/collection_ust or https://doi.org/10.21949/1530857.
Reclaimed stabilized base (RSB) is a common technique utilized to rehabilitate roadways. RSB involves reclaiming the base material and adding a stabilizing agent to increase the strength and durability of the base/subbase structure. This technique involves pulverizing some of the existing pavement along with a portion of the underlying base materia
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Traditional methods for communicating the presence of maintenance activities and work zones have been done with a variety of fixed signs. The increase of in-vehicle connectivity on roads—either directly integrated into the vehicle or via an application running on a mobile phone–provides an opportunity for additional communication to motorists about
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The objective of this research is to estimate and compare the highway infrastructure cost responsibility and revenue contribution of highway users in North Carolina. The study adopted the FHWA 13 vehicle classification system and analyzed data on highway infrastructure expenditures and federal and state revenue for the years 2014-2017. The results
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The primary objective of this research was to evaluate the potential for deleterious Alkali Silica Reactivity (ASR) in the state of Montana. In connection with this goal, (1) a literature review was conducted to summarize the ASR practices used by various state departments of transportation, as well as several federal agencies, (2) potential cases
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Construction work zones are inevitable parts of daily operations at roadway systems. They have a significant impact on traffic conditions and the mobility of roadway systems. The traffic impacts of work zones could significantly vary due to several interacting factors such as work zone factors (work zone location and layout, length of the closure,
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The purpose of the test reported herein was to assess the performance of the Texas Department of Transportation (TxDOT) T80SS barrier with soundwall according to the safety-performance evaluation guidelines included in the American Association of State Highway and Transportation Officials (AASHTO) Manual for Assessing Safety Hardware (MASH). The cr
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The New Jersey Department of Transportation (NJDOT) engaged Cambridge Systematics (CS) to assist with the development of an action plan that will be used to transform and modernize their Research Library.
Streambank erosion can damage bridges, hydraulic structures, and private property. In-stream structures may be installed to control river migration and limit bank erosion during large precipitation events. Historically, the structures most widely used by the Oklahoma Department of Transportation include Kellner jetties, rip rap, pile diversions, an
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The inductive loop detectors (ILDs) have been used for many decades to monitor traffic on highways. They have proven to be highly reliable in collecting traffic volumes, traffic speeds, vehicle classes, and a slew of other important traffic variables. Traffic monitoring stations that utilize ILDs are generally installed at highway locations far awa
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The Massachusetts Department of Transportation (MassDOT) Highway Division amended and reissued its Cost Recovery Procedure in 2017. Overall, the procedure has been successful; however, there is still room for improvement, including earlier participation of design consultants in addressing conflicts and discrepancies that result in construction chan
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The purpose of this research project is to: Evaluate an ultra-rapid assessment for screening aggregates to determine their reactivity when subject to alkali-silica reaction (ASR). The most reliable test method takes a full year and two years when considering mitigation using supplementary cementitious materials such as fly ash. This rapid screening
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This study aims to provide evaluation policies for the bearing capacity assessment of plate girders with corroded ends. The developed methodology was organized in three phases that each employed real corrosion data. First, inspection reports of bridges with corrosion-induced damage were processed to quantify the shape and bounds of the most common
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The Texas A&M Transportation Institute conducted the development and validation of alkali-silica reaction (ASR) testing as well as the approach for formulating ASR-resistant concrete mixtures in Texas Department of Transportation (TxDOT) Projects 0-6656 (ASR Testing: A New Approach to Aggregate Classification and Mix Design Verification) and 0-6656
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With the increasing number of people killed by distracted driving, drivers' attention has become a fundamental challenge recently. Performing non-driving-related tasks can make drivers manually, visually, and cognitively distracted. Therefore, there are various definitions and categories for distraction based on the distraction source. Yet, detecti
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An extensive literature review on cold in-place recycling (CIR) mixture designs and requirements along with laboratory testing and pavement performance prediction was conducted in this project. Based on the findings and results from prior tasks, this document shows the recommended CIR mixture design requirements, and the recommended mixture testing
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This report describes research efforts to: • Investigate the issues affecting temporary barrier deployment in work zones with constrained cross sections. • Identify and evaluate available options to potentially address those issues. • Develop improved guidelines regarding barrier deployment on Texas freeways. Efforts included: • A review of literat
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Practices for constructing and repairing catch basins and manholes vary across Minnesota municipalities and counties. There are a variety of products available for building a catch basin or manhole, sealing structure joints, and helping reduce infiltration and intrusion. Currently, there is very little documentation on the local experience with cat
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The Research, Development & Technology Transfer office at the Alaska Department of Transportation & Public Facilities (DOT&PF) hosted a virtual research peer exchange to discuss the fundamentals of FHWA’s Experimental Features Program, implementing diversity, equity, and inclusion in research practices and project selection, and the best practices
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Emergency Response Management (ERM) necessitates the use of models capable of predicting the spatial-temporal likelihood of incident occurrence. These models are used for proactive stationing in order to reduce overall response time. Traditional methods simply aggregate past incidents over space and time; such approaches fail to make useful short-t
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