Sidewalks are the essential life blood of neighborhoods, and big cities.
They suffer daily abuse from dirty feet, soiled shoes, muddy boots, canes, and wheels of every sort. Tree roots growing up from beneath, to spread and separate even concrete lines.
Sidewalks are exposed to the worst of every form of inclement weather including salt, and shovel scrapes in the winter.
The constant blistering heat of the summer sun. The driving rain from a hailstorm pelting and chipping its skin whether concrete or asphalt.
We can all appreciate the evolution and invention of sidewalks, because, wet, muddy shoes, dusty pant legs, and dress bottoms, are not appropriate or appreciated.