@BOOK{NAP9068, author = "Transportation Research Board", title = "Interim Guide for Developing a State Transportation Research Manual", doi = "10.17226/9068", url = "https://nap.nationalacademies.org/catalog/9068/interim-guide-for-developing-a-state-transportation-research-manual", year = 1995, publisher = "The National Academies Press", address = "Washington, DC" }