Interesting OVN article on Street Sweepers… one particular quote caught my eye 
“The streets are full of contaminants, insecticides, urine, rubber from cars,” said Ernie Salomon, owner of the Matilija Plaza Group. “Now all you have is a machine that sweeps that stuff up into the air.”
And here’s an article largely on the “Tymco Model 600,” the beast that roams our streets.
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Thanks for bringing this up. It’s really obnoxious. We have to rush to close our windows and doors so that we don’t have a bunch of dirt blown inside.