The early-age thermal development of structural mass concrete elements has a significant impact on the future durability and longevity of the elements. If the heat of hydration is not controlled, the elements may be susceptible to thermal cracking and damage from delayed ettringite formation. In the Phase I study, the research team reviewed publish
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United States. Department of Transportation. Federal Highway Administration. Central Federal Lands Division
2018-12-01
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PDF
The FHWA-CFLHD is proposing refinements to how its Permanent Stormwater Management Design Process is implemented. This section aims to document the permanent Stormwater Design process so that projects can consistently evaluate stormwater BMPs during project development. This will improve stormwater treatment on FHWA-CFLHD projects, improve consiste
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United States. Department of Transportation. Federal Highway Administration
2020-01-01
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PDF
Pedestrian fatalities are on the rise compared to all traffic fatalities. To reduce pedestrian fatalities, the Federal Highway Administration (FHWA) is making an effort to reduce pedestrian fatalities and injuries at uncontrolled crossing locations through Safe Transportation for Every Pedestrian (STEP). FHWA’s actions through the STEP program also
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United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division
2015-03-01
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PDF
This book was developed to be used as a tool for Western Federal Lands Highway Division staff, our partnering agencies, and the contractors we work with. The Construction Paynote Examples book gives examples of how a contractor should submit a request for payment (paynote), and what documentation is required to support their request. Section 109 Me
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United States. Department of Transportation. Federal Highway Administration. Central Federal Lands Highway Division
2012-04-01
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PDF
This book was developed to be used as a guideline for Central Federal Lands Highway Division staff, our partnering agencies, and the contractors we work with. The Construction Paynote Examples book gives examples of how a contractor should submit a request for payment (paynote), and examples of documentation that adequately support their request. C
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United States. Department of Transportation. Federal Highway Administration. Federal Lands Highway Division
2024-12-01
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PDF
There are two basic specification types that are developed by writers in Federal Lands Highway (FLH): Project-specific Specifications to address a requirement for a single project and Supplemental Specifications to be approved for standard use on specified projects. Both types of specification are used in the Special Contract Requirements (SCRs) fo
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United States. Department of Transportation. Federal Highway Administration
2024-08-01
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PDF
This factsheet summarizes emerging practices for planning, designing, and implementing NBS. FHWA published an Implementation Guide in 2019 to help transportation practitioners understand how and where to use NBS for highway resilience to protect coastal roads and bridges from flooding, erosion, storm surge, and sea level rise. In 2021, FHWA conduct
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This document details the process that the Volpe National Transportation Systems Center (Volpe) used to develop travel forecasting models for the Federal Highway Administration (FHWA). These models enable FHWA to forecast future changes in the use of passenger and freight vehicles (as measured by the number of vehicle-miles traveled, or VMT) that a
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Maintenance Decision Support System (MDSS) technology is a tool initially developed using Federal Highway Administration (FHWA) funding. It is designed to integrate state-of-the-art weather forecasting and pavement modeling with an agency’s rules of practice for winter operations to generate recommended maintenance actions. The goal is to enhance w
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This report analyzed the effects of portable changeable message signs (PCMS) on driver behavior in terms of speed characteristics using a driving simulator. Fifty-two participants from different age groups evaluated four messaging signs with “text and number” by driving through a virtual work zone. Driver reactions to the message signs were analyze
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This report describes the result of a study aiming at illustrating how models of winter road maintenance (WRM) performance measures can be applied to investigate the implications of different winter road maintenance level of service (LOS) standards under specific winter weather conditions. The study introduces a cost-benefit framework integrating t
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The research presented in this report is motivated by the need to develop an outcome based WRM performance measurement system with a specific focus on investigating the feasibility of inferring WRM performance from a traffic state. The research studied the impact of winter weather and road surface conditions (RSC) on the average traffic speed of ru
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This project investigates the performance of a smartphone-based road surface condition (RSC) monitoring system called AVL-Genius. The system uses a smartphone to capture images of the road surface along a route and automatically classifies each image into one of several distinct RSC classes. It can also generate route level RSC statistics that can
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Herbert T. Landow’s "The Elimination of Random Car Sequence in Trains" (1961) emphasizes the economic and operational consequences of random car sequencing during train assembly. He compares traditional flat and hump yard designs, analyzing their physical layouts, switching procedures, and limitations in eliminating randomness within train consists
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This study identifies equity challenges in current transportation payment systems, specifically for transit, parking, and vehicle tolls. The methodology included comprehensive literature reviews, an inventory of 49 global transit systems, seven case studies, and expert interviews to assess payment accessibility, technical rules, interoperability, a
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With the addition of integrated telecommunications and information technology or telematics to maintenance fleet vehicles, we gain the ability to collect data that may aid in identifying current road and weather conditions. However, care must be taken to assure these data reflect actual conditions and not a microclimate created by the vehicle.
Wintertime precipitation has profound impacts on surface transportation. Surface transportation ramifications include decreased public safety, compromised traveler mobility, diminished productivity of roadway users, and adverse environmental effects due to the need to chemically treat icy roads. The winter road maintenance community can benefit fro
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Wintertime precipitation has profound impacts on surface transportation. Surface transportation ramifications include decreased public safety, compromised traveler mobility, diminished productivity of roadway users, and adverse environmental effects due to the need to chemically treat icy roads. The winter road maintenance community can benefit fro
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Portable changeable message signs (PCMSs) have been employed in highway work zones as an innovative temporary traffic control (TTC) device in the United Stated for many years. The traditional message format on a PCMS is text-based, which has been found to have several limitations in recent studies, such as confusing drivers and delaying their respo
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