Dan,
I too may have felt sorry for the time a sport compact was on my bumper in the rain as I gradually increased my speed around a curvy. That time, I watched in the rear view mirror of my Grand Caravan as he lost it and smacked the guard rail. Another time, I was on the bumper of a similar slow-moving sport compact (my bad), again with said Caravan, only to be trumped by the CHP officer right behind me.
With only 15-20 foot long onramps from a dead stop and equivalent offramps, this freeway actually invites acceleration and braking tests, but you gotta be careful of the other guys.
Sherwood