Twenty years ago, younger Homer and Marge were riding on bikes down the highway. They attempted to kiss each other while biking, but Homer fell down and crashed his bike. Ned and Maude, who were driving by, noticed them as hitchhikers and picked them up. However, Ned and Maude were shocked when they found out that Homer and Marge weren't married. The episode in which the car appears was released in 2008, and it can be assumed that it takes place in roughly the same time; If the floating timeline is to be believed/followed, then this meeting between the Simpsons and the Flanders took place in 1988 and this car would not exist yet.