A simple metric like # of people times meter lanes of road divided by square meter of sidewalk would be useful in characterizing areas. I recently vacationed in

A simple metric like # of people times meter lanes of road divided by square meter of sidewalk would be useful in characterizing areas. I recently vacationed in a neighborhood where the local grocery store was within walking distance but there was no sidewalk or walking path to get there. Any sidewalks that are put in are cut into personal property instead of the roadway, so there isn't much support for them among voters.