yes. I was wondering if anyone would catch that. My son and I ride our bikes there every year in June for vintage cycle racing. Have been doing that for the past 8 years or so.
I'm not sure if they do it each day of the weekend's events because we only have attended on Saturday but if you are there early enough they allow spectators to ride the track. You pay an extra fee and are directed to a certain turn along the track for a brief meeting. The rules are a pace car leads the group and another brings up the rear, no passing, and 45MPH top speed. They said they had track monitors stationed along the 4 mile+ track. If any rules were broken they would escort us off the track.
The last time we did it, about 3 years ago, we (son, my brother in law, and I) were in the middle of the group of maybe 30. Of the three of us, my son was on his Honda CB750F, me on the my RSTD, b-in-law on a late model Goldwing) and in that order. As it worked out there was an antique bike, maybe '20's vintage in front of my son. The vintage bike was pretty slow so from our little group to those in front of him a large gap appeared in pretty short order.
On a particularly sharp corner the vintage bike went wide and almost or even touched the safety sand. He backed off and kept it upright but my 23 year old son took the opportunity to pass as did at least 4-5 more bikes. I never saw my son's bike after that. He said later he was well over 100 at times. Anyway, brother in law and I being much older did crank it up too but I don't think we ever were over 85MPH. Our speed did increase with each lap as we got more comfortable leading to my floorboard scraping in the tight corners. It was truely a blast but would have been more fun 40 years ago on a sportier bike. We were never reprimanded nor saw any sign of anyone trying slow us down. I don't recall how many laps it was but I think we were on the track for 15-20 minutes. I think we did eventually close the gap to the leaders but it was just before the end of the ride.