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.
The National Road Research Alliance (NRRA), a multi-state pooled-fund program, exists to provide strategic implementation of pavement engineering solutions through cooperative research. NRRA is led by an Executive Committee of state DOT partners, and supported by numerous agency and industry partner representatives. Members provide expertise to NRR
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This study investigates the dynamic modulus of Cold-in-Place Recycling (CIR) pavement material and its performance using pavement performance data, field testing, laboratory testing, and Pavement Mechanistic-Empirical Design Guide (PMED) software analysis. Colorado Department of Transportation (CDOT) has 37 projects with over 8 million square yards
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Field evaluation of adaptive signal control technologies (ASCT) is very important in understanding the system’s contribution to safety and operational efficiency. Data were collected at six intersections along the Neil Street corridor in Champaign, Illinois, before deployment of SynchroGreen, an ASCT system. The volume, delay, and queue length data
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Current environmental regulations require TDOT to develop and implement a stormwater management program (SWMP) characterize the contaminant of concern and reduce it to the extent practical for stormwater runoff from all portions of TDOT’s municipal separate storm sewer system (MS4) maintained within the State. Section 2.2 of the existing TDOT MS4 P
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The purpose of this study is to characterize traffic inputs in support of the new Mechanistic-Empirical Pavement Design Guide for the State of Michigan. These traffic characteristics include monthly adjustment factors (MAF), hourly distribution factors (HDF), vehicle class distributions (VCD), axle groups per vehicle (AGPV), and axle load distribut
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This paper qualitatively identifies the impacts of bicycle infrastructure on all roadway users, including safety, operations, and travel route choice. Bicycle infrastructure includes shared lanes, conventional bike lanes, and separated bike lanes. The treatment of bicycle infrastructure at intersections is of particular interest, as the management
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This research aimed to develop an understanding of the safety and operational implications of using the flashing yellow arrow (FYA) in permitted and protected/permitted right turn (PPRT) operations to maximize safety and efficiency. This report includes a review of more than 50 scientific and technical articles on the selection of right turn phasin
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The Highway Safety Manual (HSM) is a national manual for analyzing the highway safety of various facilities, including rural roads, urban arterials, freeways, and intersections. The HSM was first published in 2010, and a 2014 supplement addressed freeway interchanges. The HSM incorporated the safety modeling results from several National Cooperativ
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The NYU Rudin Center annually hosts the Emerging Leaders in Transportation program, which develops early-career transportation professionals to develop and promote innovations within their organization. Emerging Leaders in Transportation provides participants with a career development platform for networking, sharing ideas and gaining insight from
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The Transportation Life Cycle Assessment (LCA) Synthesis includes an LCA Learning Module Series, case studies, and analytics on the use of the modules. The module series is a set of narrated slideshows on topics related to environmental LCA. Phase I produced 27 modules, and Phase II added 10 more. The modules are available for download on the Lamar
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The 2010 Highway Safety Manual (HSM) provides methods for predicting the number of motor vehicle crashes on various roadway facilities (AASHTO, 2010). However, it includes only a simplistic method for predicting the number of bicycle-related crashes. The research team investigated the bicycle-specific crash data in eight potential study areas aroun
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Researchers found that agencies with effective response plans for severe winter weather employ a transportation emergency management office, facilitate interagency cooperation, and embrace technologies for tracking and reallocating equipment.
In this research effort, a trip-based approach is employed to study the benefits of investments on public transit and non-motorized transportation in the Central Florida region. Florida trip-based method is geared toward auto-oriented mobility analysis. With growing emphasis in Florida’s urban regions on non-auto mobility – public transit, pedestri
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A major hurdle in freight demand modeling has always been a lack of adequate data on freight movements for different industry sectors for planning applications. Several data sources are available for freight planning purposes in the United States. Of these, the most commonly adopted sources include Freight Analysis Framework (FAF), Transearch (TS),
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State agencies have implemented weigh-in-motion (WIM) sensors for years to assess and monitor various aspects of highway commercial motor vehicle traffic. This study analyzes 3.5 years of WIM data from 33 WIM sites provided by the Indiana Department of Transportation (INDOT) and compares systematic procedures to identify WIM locations with measurem
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The use of green versus traditional amber lights on Truck Mounted Attenuators (TMAs) was investigated to see if their use could help to improve safety in mobile work zones. Four light color configurations were evaluated via a combination of simulator and field study: amber/white, green only, green/white, and green/amber. The TMAs were used as shado
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The objectives of this research are to: review state and federal eff orts regarding geotechnical asset management; determine local compatibility issues and existing Louisiana systems; develop database parameters for storing geotechnical asset information; identify logical steps toward full implementation; recommend strategies for implementation; an
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With noise issues arising frequently in urban areas due to heavy traffic, it might be possible to use High Friction Surfaces (HFS) to reduce the sound to an acceptable level without a barrier wall or in conjunction with one. This research project determines the influence of HFS on traffic noise levels. The purpose of this project is to extend on pr
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Concrete pavement slab differential settlement (drop-off) is one of the major problems encountered in jointed rigid pavements after years of service. The conventional method to rectify this problem is to lift the slabs using injected asphalt or concrete mud, slab grinding, partial/full depth repair or asphalt overlay. The Tennessee Department of Tr
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Lane width evaluation is one of the crucial aspects in road safety inspection. Moreover, lane width is one of the most important attributes of a road digital map for many applications, such as driver assistance systems and risk assessment. Using mobile mapping systems (MMSs) equipped with laser scanners is a safe and cost-effective method for rapid
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