The Lincoln Highway pre-dates the 1930's US numbered highway system. There is not a single numbered highway nor a single Interstate that follows the original pre-1930 "highway" (it was a single track dirt road some of the way).
Like Route 66, the Lincoln Highway has a following, guidebooks, clubs, and at least one magazine. I've followed sections when the highway was going where I was going, have lived in places along it, and have at least one Lincoln Highway nostalgia book that I cannot rank with my better Route 66 guides.
Best defined as the list of cities, maybe: NYC, Newark, Trenton, Philadelphia, York, Bedford, Pittsburgh, Chester, Canton, Mansfield, Van Wert, Fort Wayne, South Bend, Joliet, Aurora, Clinton, Marshalltown, Denison, Omaha, Kearney, North Platte, Sidney, Cheyenne, Medicine Bow, Rock Springs, Fort Bridger, Salt Lake City, Ely, Austin, Fallon, Truckee, Auburn, Sacramento, San Francisco.
Some people confuse the Lincoln Highway with the National Road, which went from the nation's Capitol to San Francisco on a slightly more southern route. The National Highway also has its folwers, and similarly can't be tied to a single US numbered highway or Interstate highway.
Tom Test
Itasca Spirit 29B