Wide roads do cut neighborhoods in half and make them so much less walkable. We don't need freeways everywhere. While I like driving fast, there are other concerns than speed and even safety. I recommend strongtowns.org's article on "stroads": https://www.strongtowns.org/journal/2013/3/4/the-stroad.html

I have a similar straight road with a school near my house. To make matters worse it's a main artery to the freeway. However, the city solved this much better. As suggested in the article the road is fairly narrow and there are physical separators in the middle of the road in the area where the school is. You can still easily go the speed limit, yet from my anecdotal experience of driving the road at least twice a day I'm pretty much the only person going slightly over the speed limit. I would argue that the road very much works as intended to transport cars efficiently and children safely.