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Slab on Grade

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We are currently reviewing a 7" thick industrial floor already in service
for about 4 months with saw cuts at 20' c/c in one direction and 15' c/c
in the other. There are a few cracks in the floor ranging from about 0.016"
to 0.060" with the majority being around 0.030".  Does anyone know of a
published acceptable crack width for a slab on grade?

Tow motors driving across the unsealed joints create an irritating
thumping noise.  Has anyone had this situation before?

Brian McDonald P.Eng