Many many moons ago, late 60s early 70s, they use to race right through the Nicolet National forest. My Gramma and Grampa had a cabin up there and the people race just about any vehicle they could get their hands on. Did motorcycles one day and cars/trucks the next. My Dad and Grampa would take us kids in the jeep, following the racing route, the next day after the race and there would be vehicles stranded all over the woods.
As a spectator, you just found a place in the woods, by a creek was always interesting, sat your butt down and watched the action. Of course, there was always a fair amount of slow time when nothing was coming past your area.
Much more sophisticated now a days.