for current and probable future traffic demands and the needs of the locality of the highway". References "Interstate standards", John Lansford, employee North Carolina Department of Transportation, misc.transport.road newsgroup November 2, 1999 External links Public Safety Standards, United States (Federal Government) – Offers free downloads of documents, including AASHTO's "A Policy on Design Standards", that have been incorporated by reference into the US Code of Federal Regulations and can therefore be freely copied as edicts of government. AASHTO Bookstore – A Policy on Design Standards – Interstate System () Standards Standards of the United States Construction standards