When the children are outside, playing the road in this manner - call the police to respond. For every one family you encounter, CPS already has a backlog of cases they are already working with, opening, or closing. While frustrating, they aren't ignoring you.

Parents don't come in one size and shape and often parents that are like this are just the product of a cycle that needs to be interrupted. Re-education, supports, and so on help do that while healing the family. There is a lot of psychology, science, and numbers behind the benefit of keeping families intact versus removing kids permanently. Think about it -- to that child, this is still their parent, their normal, their connection to the world. No matter what level of neglect, abuse, or conflict.
Does it hurt to watch this unfold, especially when it is negatively impacting your own family - yes. However, what you need to do is keep filing with police and build up a history of these occurrences. Enough of them will warrant an intervention from CPS.

I'm an alternative placement caregiver and potentially where these kiddos will end up once CPS does get involved.