I don't think the legislation is limited to bicycles, but I'm pretty sure that bicycle enthusiasts were responsible for it getting to the forefront. The part of Michigan where I live can be pretty unfriendly to bicycle riders. There is a lot of poverty here, and you see more kids and "down and out" people riding than other types of riders. Lots of men with dui's and people who can't afford cars. It's very rural in my particular community, and there are getting to be more of us on the road.
I also drive a school bus, and I see a lot of people making HUGE driving errors. It's like I have a bird's eye view of what's going on with drivers because I'm on the road so much. I don't think the bill would ever be publicized enough to have the general public adopt more careful habits, but it would give judges more options.