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What is the difference between a Type I and Type II highway project as defined by FHWA?

April 26, 2017defined fhwa highway ii project type

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What is the difference between a Type I and Type II highway project as defined by FHWA?

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Type I refers to projects in which noise abatement is considered a feature on a new or expanded highway. Type II refers to projects in which noise abatement is considered a retrofit on an existing highway.