I think out of staters underestimate how long it takes for many Utah residents to get on I-15, get stuck in traffic and then park 2 miles from the stadium, walk 45 minutes to the stadium and do it all over again after a long hot or cold game. Then when you're playing Idaho State, Savannah state and the like its amazing as many fans show up as they do.
While in Austin, we hit zero traffic driving to the game and leaving the game. The Austin infastructure is amazing compared to Utah county. Leaving the game I was conditioned to think we would hit traffic... Nope, again zero traffic. They had that situation dialed in. Provo easily has the worst traffic in Utah particularly by the campus's of BYU and UVU.