| | Roadgap Conventions, Glossary and Guidelines |
 | | This did not always mean Interstate highway (q.v.) construction, but did mean that special steps were to be taken to improve transport through the area as a national priority task, such as upgrading or widening of existing routes, in addition to formation or management of new Interstates and/or Federal and state highways (qq.v.). |
 | | Many of the NEI highway alignments were merged into the new US highway system, but had to be re-numbered as the numbering systems were not in general compatible; the only one that kept its designation was multi-state NEI 1, most of which became US 1 (and portions later US 1A). |
 | | This makes their designation as federal highways a bit of a misnomer; although they may have been constructed with some amount of federal aid, only a subset of US highways remain part of the nationally funded National Highway System (q.v.) and therefore in general their maintenance is paid for by the state they run within. |
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