Linear Air Motors was not based in Michigan but apparently they did have a test track in Walled Lake. They also demonstrated their rapid transit prototype idea at the Walled Lake Amusement Park. They called it the "Insta-Glide" system and it resembled a small monorail. Additionally, they had an idea for transport via tube which is a primitive precursor to Elon Musk's Hyperloop idea in a way. Actually, they had lots of ideas and were mainly pitching local municipalities around the US, looking for government funding. The mentions in the newspapers fizzle out after 1978 so I don't think they ever had a project come to fruition.