Wikipedia:Articles for deletion/List of abandoned highways in the United States
If the "unused" portions of each highway are worth mentioning at all, which I don't think they are, they should be listed on each highway's respective article.  At best, they are 
— User:Fredddie, 18:47, 12 December 2018 (UTC)
Stance: delete
Cited policy: WP:TRIVIA (Wikipedia:Manual of Style)