> And even the six-lane arterials have sidewalks here: https://goo.gl/maps/DUR8mdVQysu and https://goo.gl/maps/hZ4dL3yj8F32

I would definitely change the order from

    road | sidewalk | lawn

to

    road | lawn | sidewalk

in those two cases. There is ample space, so why not make the sidewalk safer by putting a strip of grass between the sidewalk and the road.