We used to have an old parking enforcement guy in the town where I gre up who would put the chalk on the sidewall of the tire, I suppose in the same location on each vehicle, to see if the vehicle had moved. I note the radical angle of this one, where it would seem they would mark the chalk on the tread portion. Makes sense, as it would be a better indicator that there had been movement. Otherwise you stood a 1 in 360 chance of being ticketed even if you had moved.
The good old days.
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