Question: Is Route 66 generally unknown to Americans?, Answer:No, Description of U.S. Route 66: Former US Highway between Chicago and Los Angeles, Fact1: Route 66 was immortalized in the hit "Route 66" by Bobby Troupe., Fact2: "Route 66" as a song has reached the Billboard Top Charts multiple times and is still played often.
Step1: In what hit song was Route 66 mentioned?, Step2: Is #1 a little-known song in America?, Wikipedia page for step 1: Route 66, Wikipedia page for step 2: Bobby Troupe, not_definitive_answer: False, incorrect_answer: False