Speed limits, and seat belts are not equivelant examples. A speed limit is a restriction on risk to others, and property, a seatbelt is a reduction on the risk to only oneself, unless one has passengers, but even that has its logical limits. I can perhaps see the parallel you are drawing with speed limits, but I’m not entirely sure that it is necessarily an accurate comparison to make. To speed requires willful intent to endanger. As such, I could see it being argued that it is a violation of the Non-Aggression Principle. Not wearing a mask, however, is really only willful intent to endanger anothor if one is knowingly ill, and willfully spreads it to others (and, if so, it should be punished accordingly); however, if one is not knowingly ill, then there is no aggression.