In an auto accident where the person is driving for work, which coverage takes priority, MED/PIP or business auto first party coverage?

I am going on the premise that your car was struck by a commercial vehicle. In this case, your MEDPAY/PIP takes priority and then iMEDPAY s subrogated against any claim you may file against the other driver and his employer and PIP recovers directly from the other policy.  Note that MEDPAY and PIP are different and have different rules.