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Center for Environmental Excellence | AASHTO
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Programming for Reducing the Noise from Corrugations in Transit Rails

By Amber GarnettMay 7, 2021Leave a comment

Problem Statement The operation of steel-wheeled transit vehicles on steel rails may develop short-pitch corrugation of the rails. The interaction of the wheels rolling over the corrugated rails generates noise…

Transit Warning Signal Dose-Response Data Development

By Amber GarnettMay 7, 2021Leave a comment

Problem Statement The specific noise issue in the vicinity of at-grade rail crossings is locomotive warning horn and crossing bell sounds, which cause significant noise impacts. The acoustic signatures of…

Vibration Dose-Response Data Development

By Amber GarnettMay 7, 2021Leave a comment

Problem Statement Vibration propagation through the ground is physically very similar to the propagation of noise through the air. Vibration and noise are similar in other respects as well; however,…

Data Synthesis for R Vibration Insertion Loss Afforded Tie and Ballast Trackwork with Ballast Mats, Tie Boots, and Trenches

By Amber GarnettMay 7, 2021Leave a comment

Problem Statement On a national scale, increased emphasis is being placed on expansion and refurbishment of fixed-guideway transit systems, especially steel rail-steel wheel formats. This has exacerbated the need for…

Directive Transit Vehicle Warning System

By Amber GarnettMay 7, 2021Leave a comment

Problem Statement Transit vehicular warning horns are relatively omni-directional and can be a source of annoyance in areas of the community adjacent to rail lines. For example, train horns sounded…

Assessment of the Potential for a Climate Change “Truth in Advertising” Initiative for the Transportation Sector

By Amber GarnettMay 7, 2021Leave a comment

Problem Currently, transportation goods and services are marketed, promoted, and sold with very little information related to their carbon footprint or other possible impacts to the climate. For example, the…

Promoting Eco-Driving to Reduce GHG Emissions

By Amber GarnettMay 7, 2021Leave a comment

Per the Moving Cooler report, “eco-driving strategies can achieve cumulative greenhouse gas (GHG) reductions by changing the efficiency of individual driving behavior, if widely embraced and practiced.” The Moving Cooler…

Induced Demand from Operational Efficiency, and the Impact on GHG Emissions (Part 2 — Analysis)

By Amber GarnettMay 7, 2021Leave a comment

Induced demand – also referred to as latent demand or the “rebound effect” – is the phenomenon that after supply increases, more of a good is consumed. In economic terms,…

Induced Demand from Operational Efficiency, and the Impact on GHG Emissions (Part 1 — Synthesis)

By Amber GarnettMay 7, 2021Leave a comment

Problem Induced demand – also referred to as latent demand – is the phenomenon that after supply increases, more of a good is consumed. In economic terms, the demand for…

Improved Operational Efficiency and the Impact on Greenhouse Gas Emissions

By Amber GarnettMay 7, 2021Leave a comment

TERI Administrator Note (May 2011): FHWA has a project underway that is addressing these issues. (John Davies is FHWA contract point.) Problem One of the approaches for reducing transportation-related greenhouse…

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