Vespa on the eway

Saw a Vespa on I696 a couple of days ago - is that even legal? I don't think so. I think he went from Hilton to Woodward - kind of like the far right lane exit lane for like 1/4 mile - still I was cruising on the R6 around 85 or so and looked over and saw the gay looking fellow on a powder blue vespa on the freeway - he was wearing a full face helmet, shorts, t-shirt, etc. - I was like WTF? lol...