@BOOK{NAP6337, author = "Transportation Research Board", title = "Smoothness Specifications for Pavements: Final Report", doi = "10.17226/6337", url = "https://nap.nationalacademies.org/catalog/6337/smoothness-specifications-for-pavements-final-report", year = 1997, publisher = "The National Academies Press", address = "Washington, DC" }