The crossword solutions for the term 'CHECKER DOUBLE-DECKER' are 'KING' (4 letters). The term 'Checker Double-Decker' is a type of bus that was manufactured by the Checker Motors Corporation from the 1950s to the 1980s. It was a double-decker bus, meaning it had two levels, and was used for public transportation. The term 'KING' in this context refers to the fact that the Checker Double-Decker was the largest and most luxurious bus of its time, thus earning it the nickname 'KING of the Road'.