 With the completion of Euclid Avenue in 1967, US 421 was realigned again to use Euclid Avenue from the west end of State Street northeast (with US 58 and other routes) to Piedmont Avenue.There it turned southeast on Piedmont Avenue and Mary Street and southwest on Goodson Street, crossing the state line directly onto Pennsylvania Avenue.This had been State Route 76-Y along Mary Street east of Oakview Avenue (old U.S. Route 11, new State Route 113) and part of State Route 76 along Goodson Street.