n. A person who is passionate about roads, including road maps, road construction, the history of roads, and road travel.
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However roadgeeks are not necessarily interested in motor vehicles; there may also be an interest in cartography and map design. Enthusiasts may focus on a single activity related to roads, such as driving the full length of the highway system in a specific area, researching the history, planning and quirks of a particular road or national highway system. They are occasionally quoted in the press on topics related to the history of roads. Sometimes, road geeks are called “highway historians” for the knowledge and interests.
—“Roadgeeks,” The Dabbler, June 06, 2015
If you'd consider basically any road travel enthusiast to be a roadgeek, then it'd basically be all truckers. If you'd only consider someone who actively keeps up with construction projects (other than in areas where they're headed), keeps up to date on signage oddity/old sign sightings and actively searches for them, and sometimes goes out of the way to drive an old alignment/clinch a highway, then it's likely very few.
—Molandfreak, “Re: What Percentage of Truckers Are Roadgeeks,” AARoads Forum, October 10, 2014
Maybe roadgeeks can find something to fascinate them on just about any highway in America, but they also have their own special landmarks and pilgrimages. Some of these oddities are so bizarre they’d be spotted even by amateurs like me. There's the traffic light in Syracuse's Tipperary Hill where the green signal is on the top (a nod to the neighborhood's Irish roots). Or 1010th Street west of Eau Claire, Wisconsin, believed to be the nation’s highest-numbered road.
—Ken Jennings, Maphead, Scribner, September 20, 2011
1997 (earliest)
Why did I, a Kentucky resident, create a West Virginia Highways Page? Well, there are several reasons. First, there was no West Virginia Highways Page yet on the Internet. Second, I didn't do Kentucky because my home state has too many unmarked routes, many of which don't even show up on the county maps because they are city streets, and I wanted to make my contribution to the growing amount of road-geek information available on the Internet.
—H. Belkins, “Millennium Highway West Virginia Highways Page,” Millennium Highway, November 15, 1997
Roadgeeks go by many other names, incuding roadfan, roads scholar, viaphile, odologist (from the Greek odos, "way," the same root used by odometer), and, as the citation from The Dabbler notes, highway historian.