I didn't want to hijack the slot car drag racing thread. Here are a few pics of round-d-round slotters getting it done HAMB style . . .
These are not mine (got out of the hobby about 5 years ago) but most are 1/24-1/25. There is also a large contingent of 1/32 ones out there also. Been thinking about routing a 4 lane oval for the basement, again.