I think it makes sense - you'd probably be driving the car in for the inspection, so it'd be nice to have some sort of confidence in your seatbelt for that drive.
While they offered a relatively short sentence,
prosecutors were absolutely determined to get a
felony plea and some kind of prison time, according
to sources cited by The Huffington Post. They wanted
those results because they believed it would justify
their bringing charges in the first place, according
to HuffPo.