Just did one of Friday. Perfect road with lane wide shoulders, but it was very cross windy that day made it a little sketch. A shorter segment was used for TT nationals last year
It starts off with a hill, but I wanted to get as close to 24miles as I could.
Its the Maryland side of Harpers Ferry

Further north is another road I rode on the next day with same wide shoulders. Haven't had a chance to map it on strava yet

https://www.strava.com/routes/26387678

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