Hmmm. I just took a look at the change history, and I don't think I was the one that added that tag. It looks like it was added ~8 years ago by andrewpmk. 

https://www.openstreetmap.org/way/4663240/history

You may well be right; while not a decent place to ride a bike, you could presumably enter/exit at Transit Road before it becomes an expressway. 