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Save the Date: June 4-8, 2023 – AASHTO Committee on Environment and Sustainability Annual Meeting
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Center for Environmental Excellence | AASHTO
Center for Environmental Excellence | AASHTO
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  • Laws & Agreements
    • Programmatic Agreements Library (PAL)
    • Case Law Updates on the Environment (CLUE)
    • National Environmental Policy Act (NEPA)
    • NEPA Assignment
  • State of the Practice
    • Case Studies
    • Communities of Practice
    • Practitioner Interviews
  • Education
    • Environmental Topics
      • Active Transportation
      • Air Quality
      • Climate Change
      • Environmental Justice
      • Invasive Species/Vegetation
      • Stormwater
      • Sustainability
      • Traffic Noise
      • Waste Management/Recycling
      • Water Quality/Wetlands
      • Wildlife and Ecosystems
    • Practical Applications
      • Context Sensitive Solutions
      • Emerging Technologies
      • Environmental Management Systems
      • Geographic Information Systems
      • NEPA Process
      • Planning & Environment Linkages
      • Project Delivery
      • Protecting Cultural Resources
      • Public Involvement
      • Transportation Policy
      • Using the Practitioner’s Handbooks
  • News
  • Meetings & Events
    • Past Events
  • Resources
    • Practitioner’s Handbooks
    • AASHTO Publications
    • AASHTO Standing Committees
    • Federal & State Agencies
    • Trade Associations
    • Research
      • NCHRP 25-25
      • TERI Database
      • TRB Committees

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DOT Interface for Project-Level Air Quality Modeling

By Amber GarnettJune 28, 2022

State Departments of Transportation (DOTs) conduct project-level air quality analyses for the National Environmental Protection Act (NEPA) and to meet the requirements of the Environmental Protection Agency’s (EPA) transportation conformity…

Public perception of pollinator habitat mowing/management schedules

By Amber GarnettJune 24, 2022

Is there a negative perception of DOTs if the mowing schedule leaves taller vegetation throughout more of the year and later into the growing season? Does education about the reasoning…

Strategies for effective interseeding to increase wildflower diversity in existing roadside vegetation

By Amber GarnettJune 24, 2022

Interseeding (also known as overseeding) can increase flowering plant diversity in grass-dominated stands of vegetation but has rarely been used on roadsides. Research is needed to better understand how to…

DOT Guidance on Induced Demand Effects of various Roadway Investments

By Amber GarnettJune 24, 2022

Operational improvements such as auxiliary lanes and intelligent transportation system treatments are designed to reduce congestion. Even these minor congestion improvement strategies and investments intended to optimize existing roadway system…

Development of a Standardized Testing Protocol for the Approval of Field-cured Products for Use on Highway Maintenance and Construction Projects

By Amber GarnettJune 13, 2022

Background DOTs routinely receive requests to add new products and materials to their lists of approved products, including culvert repair products and materials used for road and bridge repair. Many…

Risk-Based Comparisons of Alternatives for NEPA

By Amber GarnettJune 10, 2022

Comparisons of alternative build and no-build scenarios in project-level air quality analyses for NEPA and conformity typically focus on comparisons of emissions and/or ambient concentrations of pollutants, namely greenhouse gases…

Framework for Analyzing and Mitigating Highway-related Noise and Vibration Impacts on Terrestrial Wildlife

By Amber GarnettJune 29, 2021

Background Currently, there is minimal guidance from federal agencies on how to conduct noise and vibration analyses specific to wildlife, which results in differing approaches to noise analyses that may…

Concrete Curing pH Level Impacts for Minimization of Harm to Aquatic Species

By ahardingJune 22, 2021

FY2022 NCHRP PROBLEM STATEMENT OUTLINE 1. Problem Title Concrete Curing pH Level Impacts for Minimization of Harm to Aquatic Species 2. Background Construction and maintenance actions regularly require state Department…

Synthesis of State DOT Best Practices for Regulated Material Management and the Creation of New National Guidelines

By ahardingJune 22, 2021

During project development and construction, DOT agencies must assess the liability of real property acquisitions of contaminated property as well as contaminated waste management generated by disturbing these areas during…

Best Management Practices to Identify and Mitigate Per- and polyfluoroalkyl Substances (PFAS) Impacts on State DOT Construction Projects and Maintenance Operations

By Amber GarnettJune 15, 2021

Background Per- and polyfluoroalkyl substances (PFAS) are a group of manmade fluorinated chemicals that have been manufactured and used in a variety of industries since the 1940’s. They are persistent…

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  • All Content

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The Center for Environmental Excellence by the American Association of State Highway and Transportation Officials (AASHTO) has been developed in cooperation with the Federal Highway Administration to promote environmental stewardship and to encourage innovative ways to streamline the transportation delivery process.

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