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The authors gratefully acknowledge the support and guidance of Mr. Ralph Gillmann of the Office of Highway Policy Information of Federal Highway Administration throughout this project. His valuable review comments of the concepts and methodologies are acknowledged.

The authors also acknowledge the valuable review comments by the following individuals and offices of the Federal Highway Administration (FHWA):

The authors also acknowledge the assistance of Mr. Brian Burk of Texas Department of Transportation, Ms. Terri Johnson and Mr. John Collins of Mobility Technologies, Inc, and Mr. David Garner of Ohio Department of Transportation in providing data for the case studies included in this report.

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