There are reasons I was asking the question. I worked for 6 years in Daytona for ISC/NASCAR, and the track was near I-95 and I-4, with the road in front of the track being 8 lanes wide (comparable to NW 199th). The police presence definitely helped traffic flow.
Obviously, Miami is a bigger city with a lot of non-event traffic, but there's also a larger police force. Just curiosity, more than anything. Currently, a lot of cops work on UM game days, and it probably doesn't matter (to them) whether they are directing traffic at Hard Rock or Tropical. Just seems to me like they could perform the same services if that would help to get people in/out of Tropical for game days.
Years ago, I also wrote-up an idea for running shuttles from the UM campus to Tropical, that would be one way to get the UM community over to the games without adding to the traffic. Would definitely be a shorter ride than the current busing (or mass transit if they ever finish the plan to extend the Metro to Hard Rock).