Why don't we do it in the road?

From Broken Sidewalk of Louisville, KY:

What a profoundly clear example of how stupidly sidewalks are often built. How evident that the people who build them or design them don't give them a second thought.

Every town has its own examples just as egregious as the ones Broken Sidewalk shows; an obvious example is the section of sidewalk below the 101 overpass in Pedestrianism Vol.1

Anyone else sick of this? In a nominally transit-first city like SF, why don't we start treating the rights-of-way reserved for private cars like this?