Safety Street
An track based on the classic episode Homer's Odyssey. It's a pretty normal suburban street, until safety signs start popping up out of nowhere and (ironically) create obstacles for racers to avoid. Some of them can be used as ramps. Obeying by the signs (like keeping a certain speed limit or slowing down at a Yield sign) will net you a powerful item, but like the microgames in Smash, these are risky to attempt. There are also some references, such as the dangerous intersection and the city council walking on the sidewalk, which is inexplicably crowded with speed bumps.
Springfield Vibes
A track based on the highly popular Simpsonwave sub-genre of lo-fi music. You drive through a condensed Springfield featuring the bridge, the Kwik-E Mart, and Springfield Elementary. There's a purple, hazy VHS filter during the race, and occasionally you'll have to drive on glitchy or vaporwave-esque obstructions.
Will edit in songs when I have my headphones handy.