At the U.S. Route 51 bypass in Decatur , U.S. 36 leaves I - 72 .
At the U.S. Route 51 bypass in Decatur , U.S. 36 runs due east through downtown Decatur .
At the U.S. Route 51 bypass in Decatur , U.S. 36 leaves I - 72 and runs due east through downtown Decatur .