Boone, N.C. is the only city in the country served by three branches from the same "parent" US highway. In this case, US routes 221, 321 and 421 &endash; offshoots of US 21 &endash; run through the city. At one point, there was an intersection in the center of town where all three routes came together, but a bypass has eliminated that oddity. However, there is a truck route for all three US routes signed along NC 105 on the southwestern part of town. Following are photos of this signage oddity.
This sign, on northbound US 421southbound US 221 as you approach downtown Boone from the west, shows how US 221 has been routed out of downtown.
South of downtown, NC 105 crosses US 221/321. The intersection is marked by overhead signage, as shown below.
This sign is on northbound NC 105 (which also serves as Truck North US 221 carrying traffic away from Grandfather Mountain, as well as Truck South US 421 and Truck South 321).
This sign is on South US 221/South NC 105. What it fails to say is that truck traffic for southbound US 221 should also go straight to avoid Grandfather Mountain and 221's crooked path along the side of the mountain.
The gantry above shows all three US x21 routes on one guide sign. Below is a closeup of that individual sign.
Finally, these two assemblies show all three x21 routes. The first one is located just west of the intersection where all those green guide signs are located. The second one is located further west, where the truck routes for US 321 and 421 veer off NC 105. The US 221 sign appears newer because the truck detour off Grandfather Mountain has only been posted in the past few years.
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