Although I don’t drive, nor I plan to do so as long as public transport remains usable. This one just immediately connects with bus in my head because I first heard it in Bus Simulator: Ultimate. It’s pretty good (the song).
Otherwise it would be Little Richard - Lucille: [YouTube][Piped Video] because it reminds me of riding a bicycle with dad and listening to this song on his Sony Ericsson W200i with MPS-70 external speakers.