[Automobiles]
Huh.
I must have played it at some point but I have no recollection of it.
It came out as part of AEG’s “Destination Fun” trio along with Planes (which I’ve never played or even seen) and Trains (not my thing but I know people who like it) – and the expansion was originally issued as a single package of expansions for all three games, which basically annoyed everyone who only liked one or two of them. Given how often I’ve seen Trains at conventions I suspect it was the most successful of the three; I know one other person with a physical copy of Automobiles and they haven’t got the expansion, which I found in an Essen maths trade or auction.