This particular photo, snapped in September of 1988, showcases one of my very favorite Walt Disney World set pieces. Mickey's car was featured in the original rendition of Mickey's Toontown Fair, aka Mickey's Birthdayland, which had been quickly constructed that year to celebrate the mouse's 60th anniversary. The design of the vehicle was much more rooted in comics than cartoons, and was likely inspired by Donald Duck's own automobile which was frequently featured in duck stories throughout the 1940s and 1950s. That's not surprising in that much of Mickey's Birthdayland drew inspiration from comics and was in fact a representation of Duckburg, the comic book home of Donald and Uncle Scrooge among many others.
In the 1986 comic Recalled Wreck, writer-artist Don Rosa created a story that centrally featured Donald's car.