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One of the changes that would both increase activity and nudge us toward lower car use would be to zone 1 block in 6 to be a commercial block. This would mean that in a 10 block grid radius of a given residence you would have about 38 commercial blocks. This allows more people to walk to work, to shop, to school.
Well designed commercial areas could change personalities depending on time of day. The same block could be professionals on the second and third floors, active during the day, and entertainment (restaurants, movies, ) during the night.
Not all industries should be in these commercial blocks. I would suggest that anything that is either very loud or smelly doesn’t belong, but light industrial, business to business, professional, would all fit here fairly well.
A case can be made for the medium weight businesses — ones that produce a stream of heavy truck traffic — should be on the edges of the zone, but the idea remains: Make the granularity of our cities much smaller so that more people can walk or ride a bike to their destination.
You identified cholera as a “deadly virus”. Cholera is actually caused by a bacteria. From the CDC website: “Cholera is an acute, diarrheal illness caused by infection of the intestine with the toxigenic bacterium Vibrio cholerae.”
Thanks for catching this, Don. -TZ
When science writers learn the difference between virus, bacteria, protozoa, and parasites, we will have reached Nirvana.