Below you can find the It's a heavy continuous sound a car might make or a type of seat on the back of an old roadster Jeopardy Words Answer. The answer to It's a heavy continuous sound a car might make or a type of seat on the back of an old roadster has 6 letters. This clue belongs to the Transportation category and is part of Jeopardy Word Level 650. If you scroll near the bottom you will find other clues and answers part of level 650