This TechNote covers the research conducted regarding how key features such as vertical alignment is inspected and measured during construction and the challenges and solutions performed properly so that improper placement or damage on the retaining walls - mechanically stabilized earth (MSE) can be detected in a timely manner.
The purpose of this techbrief is to highlight the research performed to evaluate the appropriateness and applicability of Light Detection and Ranging (LiDAR) sensors for collecting vulnerable road user count data under variable conditions that can provide information for measuring exposure to crash risk.
This technote summarizes the research conducted to explore the capabilities and limitations of pocket lidar for curb ramp inspections. Specifically, the study focuses on the ability of the pocket lidar to extract slope measurements, which often poses difficulties in reliably obtaining this information.
Naturalistic driving data provides a wealth of information for researchers studying driver behavior and distracted driving. However, manually annotating the videos to extract the data is costly and time consuming. This project’s research team set out to develop a system to analyze videos from the second Strategic Highway Research Program Naturalist
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This report reviews State Department of Transportation (DOT) practices related to bridge load rating, posting, and permitting procedures, analyzing publicly available documents. It examines previous versions of the National Bridge Inspection Standards (NBIS) and the most recent 2022 update, alongside the AASHTO Manual for Bridge Evaluation (MBE) an
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Leading by Example: Women Innovators and the Future of Transportation - Innovation Takes Flight: A Conversation with Paula Nouragas - The Women Leading FTA’s Regions - Making Safety Everyone's Business - Forging Ahead with Innovation! - From Bottles to Bridge Sidewalks: Turning Waste into the Next Generation of Concrete - Rumble Strips for the Safe
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Automated vehicle (AV) functionality depends on perceiving and understanding the surrounding roadway environment and infrastructure elements. SAE International® Level 2™ driving automation systems use sensors to perceive the environment and maintain a set headway with lead vehicles while remaining centered in the lane (SAE International, 2020). Alt
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This technote explores the use of PL for culvert inspections. This project was carried out in collaboration with the Utah Local Technology Assistance Program (LTAP) and the Utah Department of Transportation (UDOT). This case study supported an extensive research project underway by Utah LTAP evaluating a variety of technologies to obtain metrics fo
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This techbrief highlights the research conducted to investigate the current use of nondestructive evaluation (NDE) data to assess the condition of bridge and tunnel elements. However, based on interviews with personnel in Lead Adopter States and after consultation with engineers at FHWA, the research team focused on bridges and bridge decks.
This techbrief discusses how leveraging pocket lidar (PL) technology has become very important in for many purposes of construction. Traditionally, the construction industry has been slow to adopt digital technology for various reasons. This research delves further into this issue and discusses current methods used and a deep dive into PL technolog
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Short-span bridge superstructures are commonly made of precast concrete elements, and those elements are proportioned according to the properties of conventional concrete. The emergence of ultra-high-performance concrete (UHPC), and the release of the AASHTO Guide Specification for Structural Design with UHPC, creates new possibilities for the rede
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Traffic crashes are a leading cause of death in the United States. An extensive body of traffic safety literature explores the roadway design and behavioral contributors to fatal and serious injury crashes. Within this literature, there has been a growing recognition that some populations are significantly more likely to be killed or seriously inju
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The use of nondestructive evaluation (NDE) for the condition assessment of bridge decks is growing and has the potential to reduce operating costs and extend lifecycles by fostering cost-effective and timely interventions. Highway agencies recognize that preservation treatments can impact the lifecycle costs of bridges. Several NDE technologies ide
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The reconstruction of the Federal Highway Administration’s (FHWA) third-generation Pavement Testing Facility (PTF-3) provided a unique opportunity to incorporate the geotechnical aspects of pavements within the agency’s accelerated pavement testing program. These geotechnical aspects included various unbound and asphalt-treated base materials to es
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Driver assistance systems that facilitate economical driving (eco-driving) aim to reduce greenhouse gas emissions and improve vehicle efficiency. These systems reduce idling time at intersections and smooth acceleration and deceleration patterns. Eco-driving has the potential to improve driving comfort by smoothing speed profiles. This study explor
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For this technote, the research team collaborated with the Pennsylvania Department of Transportation (PennDOT) to perform the following tasks: Assess the ability of pocket lidar (PL) to perform 3D reconstruction of a trench and the accuracy of that 3D reconstruction. Evaluate the accuracy of derivative metrics extracted from the PL point cloud data
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This report examines emerging data sources applicable to traffic simulation model calibration. The project team categorized these data sources based on publicly accessible datasets and emphasized their potential use for enhancing traffic simulation model calibration. The study evaluates the strengths and limitations of these emerging data sources a
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During a full-scale fatigue test program at Lehigh University performed in 2018, the fatigue performance of a prototype orthotropic steel deck (OSD) with extended cut-out (EC) rib-to-floor beam (RFB) connections with partial joint penetration (PJP) welds and reinforcing fillet welds which wrap-around at the weld termination was investigated. The fu
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This report assists public agencies in the inventorying, documenting, and configuring traffic management system (TMS) assets, and illustrates how such information can support the management of these assets. It provides information for agencies to establish and manage their TMS asset inventories. This document addresses key factors in determining wh
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United States. Department of Transportation. Federal Highway Administration. Office of Operations
2024-12-01
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Urban Congestion Report (UCR)
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PDF
The Urban Congestion Report (UCR) is produced on a quarterly basis and characterizes the most recent traffic congestion and reliability trends at the national and city level. Each quarterly UCR compares data from the most recent three months to the same three months in the previous year.
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