This paper explores the public’s outlook on automated vehicles, focusing specifically on attitudes regarding safety, trust, and willingness to try, as well as the factors that influence those opinions. It compiles the results of numerous surveys and studies conducted over the past four years and tracks consumer attitudes over time, against the back
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The Federal Highway Administration's Long-Term Pavement Performance (LTPP) program issues a triannual newsletter to inform you about the progress and activities of the program. Brief updates on progress in important program activities are provided, including data collection, data releases, new products and publications, pooled fund studies, and dat
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Researchers at California Partners for Advanced Transportation Technology (PATH), a research and development program at the University of California-Berkeley, studied the potential benefits of cooperative adaptive cruise control (CACC) by deploying the technology in a platoon of three trucks. They built the CACC system and implemented it in three l
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The Federal Highway Administration (FHWA) organized 40 States to participate in the FHWA Evaluation of Low-Cost Safety Improvements Pooled Fund Study as part of its strategic highway safety plan support effort. The purpose of the study was to evaluate the safety effectiveness of low-cost safety improvement strategies through scientifically rigorous
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The GIS in Transportation team publishes quarterly newsletters to share information about significant geospatial transportation news, events, and applications. Each issue highlights a specific transportation agency's application of GIS or geospatial data and technology.
United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division
2019-11-01
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Federal Lands Highway
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The Cascade Lakes Highway is located in Central Oregon, southwest of Bend (Figure 1: Map of Study Area). The highway is within the Deschutes National Forest and provides access to many recreation sites in the Forest. The highway’s underlying ownership is USFS, but is maintained by Deschutes County. Deschutes County has become a major tourist and re
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Three phases typically occur in the development of a concrete mixture: specifying, designing, and proportioning. Specifying refers to the requirements contained in the contract documents with regards to performance requirements for the fresh and hardened concrete. Mixture design is the process of selecting mixture characteristics for the intended u
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This Tech Brief focuses specifically on approaches commonly used for curing cast-in-place concrete pavements. The most common method is the application of membrane-forming curing compounds, although fogging, plastic sheets, wetted materials, and insulated blankets may also be used depending on the type of project and the ambient conditions during a
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Accelerated bridge construction (ABC) is a technique in which large bridge elements are fabricated offsite or next to the site and are then connected onsite to complete the bridge. One such ABC method is the use of full depth precast (PC) concrete deck panels, which are placed on top of steel girders connected via shear studs. The PC concrete deck
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United States. Department of Transportation. Federal Highway Administration. Office of Infrastructure
2019-11-01
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This Technical Brief provides an overview of the several initiatives that encompass the concept of Performance Engineered Pavements (PEP). This document serves as the first in a series of PEP technical briefs on designing and accepting our nation's pavements for performance. Future technical briefs will focus on Asphalt Performance Testing (APT), C
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The Federal Highway Administration (FHWA) Office of Safety, in cooperation with the Highway Safety Manual (HSM) Implementation Pooled Fund Study, recently completed a safety analysis needs assessment for TSMO. The safety analysis needs assessment characterized the current state of practice, knowledge, and skills for quantifying the safety performan
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The Federal Highway Administration (FHWA) Office of Safety, in cooperation with the Highway Safety Manual (HSM) Implementation Pooled Fund Study, recently completed a safety analysis needs assessment for TSMO. The safety analysis needs assessment characterized the current state of practice, knowledge, and skills for quantifying the safety performan
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Dynamic part-time shoulder use (D-PTSU) opens shoulders for travel beyond fixed (or static) time periods (e.g., weekday peak periods). Dynamically operating the transportation system by matching supply-side strategies in accordance with prevailing conditions and travel demands represents an important advancement in agency adoption of Active Transpo
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United States. Department of Transportation. Federal Highway Administration. Western Federal Lands Highway Division
2019-11-01
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Federal Lands Highway
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The purpose of this report is to summarize the study of the transportation characteristics of the Teton Dam site and provide potential improvements to the site. Construction of the Teton Dam was completed in 1976 . On its first fill on June 5, 1976, the dam failed causing a catastrophic event leading to the loss of 11 lives and millions of dollars
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Hydraulic cement concrete (hereafter referred to simply as concrete) is composed of aggregates bound together by a hydrated cement paste. Concrete contains a significant amount of porosity including small gel pores (0.5 to 10 nm in size) that are an intrinsic feature of the hydration products formed when water reacts with cement, capillary pores (1
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United States. Department of Transportation. Federal Highway Administration. Office of Highway Policy Information
2019-11-01
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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 presents a summary of the 2019 Traffic Incident Management Capability Maturity Self-Assessments (TIM CM SA) completed by transportation personnel from 94 locations across the country between June and September, 2019. There are 55 scored questions in the TIM CM SA that are grouped into three sections: Strategic, Tactical, and Support. Th
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United States. Department of Transportation. Federal Highway Administration. Office of Research, Development, and Technology
2019-11-01
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FHWA R&T Now
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Federal Highway Administration's FHWA R&T Now is a newsletter containing information and updates about research, technology, and development from the U.S. Department of Transportation, Federal Highway Administration. The newsletter is an electronic newsletter and is updated approximately every other month.
A before-after empirical Bayes analysis was performed using data from 115 treated intersections in Charlotte, NC, and 218 treated intersections in Philadelphia, PA, to evaluate the safety effects of pedestrian countdown signals (PCSs). Additionally, the evaluation included 136 reference intersections in Charlotte, NC, and 597 reference intersection
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