AL 255, in the HB under the usansf route set, has its north end in the HB at AL 53. When I drove the route this morning, I saw the road continuing past AL 53, with AL 255 markers continuing to Pulaski Pike.
After Pulaski Pike, there's another AL 255 reassurance marker, shortly followed by an END AL 255 marker well before the next intersection, and after that intersection an End State Maintenance sign where the divided highway turns into two-lane Bob Wade Lane. Based on past practice with route ends at non-intersections, the new north end of AL 255 would be PulPike.
No sign of any work to extend AL 255 to US 231/431.
US 231/431 might warrant a new waypoint at BobWadeLn as an unsigned connector to AL 255, perhaps replacing MerSt (not in use).