Went through Lolo pass on 12 a few years back pulling my TT. I don't dawdle and I try to drive safely on unfamiliar road so going under the speed limit may be prudent. 12 has pullouts for these situations. The signs for them are right before the pullout so almost every one of them I passed because I was not going to jamb on my brakes to take one. I did manage to get into one of them and it was in very poor shape, ruts, debris of unknown origin, and they were barely long enough for the tow vehicle and trailer. Pitiful that they are expected to be used. 12 is a beautiful drive too.