I have seen that in MT as well. Especially when the elk are migrating. I once saw about 30 different trucks shoot at a single bull and some gal finally put it down with a 600 yard shot. It was a mess. I was glad I had already filled my tag that year. The crazy part was in the winter when I would see 10,000 head in the valley on my way into high school.We see all types in SW Colorado where I deer hunt. There are locals that just go drive around hoping to catch a glimpse of something to shoot. Then there are the guys with quads and UTVs that like to drive around right when the game should be moving, and even drive into some of the clearings and park so they don't have to walk.
Then there are those older guys here in MT that do the same thing just looking to put meat in the freezer. There are some that won't even slow down for a big buck that's more than 200 yards from the road. I've heard of other areas where the roads are lined with people waiting in their trucks for the elk herds to cross onto the public and when they do it sounds like battle.