Odd iOS Messages behavior when not in, or near, a car

Recently I have noticed, when texting while not driving, nor even near my vehicle,
that Message toggles back and forth with notices of Driving On/Driving Off

mostly I think Driving Off notices
but still

iphone SE 2nd gen, iOS 16.1.2 or such

hmm, unless iOS is telling me that the prospective recipient is driving, while I am writing the text?
To further explain: while sitting at my office desk hours having been in or near my vehicle, and well after numerous other text communications messages starts toggling the driving notice on and off while I am writing a text.