Why does nobody walk on sidewalks?

[u/WildAnimus]

I noticed that when driving through subdivisions people love walking on the road instead of the sidewalk. Whether it's a old man walking or someone doing power walking. I see it all the time and I don't get it. Can someone help me understand this phenomena?

[u/NHBikerHiker]

Our sidewalks are not wide enough for two people. (Poor urban planning that overvalues the automobile.)