BTDT.
The only thing I passed on the track was the truck picking up grass clippings!! Yes, they were mowing the grass right at the edge of the track, and had a big truck following the mowers picking up the grass clippings- all the while the track was open for laps! No way this would ever happen in this country.
I got passed by a couple of cars, and 1 bike, but traffic was thin when we were there. We did see some freshly wrecked cars at the entrance/exit to the track, a yellow 911 with armco damage down one side of the car and a smiling driver (!) and a VW polo with slightly rearranged front bumper due to some off-track excursion.
You guys are right, it is something you must do.
Bret.