Simplify the following text for a Grade 6 native English-speaking person.
Original: One of the original U.S. highways , Route 66 was established on November 11 , 1926 -- with road signs erected the following year .
Simplified: One of the original U.S. highways , Route 66 , US Highway 66 , was established on November 11 , 1926 . However , road signs did not go up until the following year .