We have somewhat similar game regs here. It prohibits firing from a conveyance, and is actually aimed at "road hunters".
It is prohibited to:
"get out of a motor vehicle along a public road and shoot a bow or firearm unless you are at least 25 yards from the vehicle."
Or
"Hunt or shoot at wild animals or birds from an airborne conveyance, from a vehicle or other land conveyance, from a motor-driven water conveyance, or from or across a public road, unless specifically authorized to do so by law or regulation. You may shoot from a motorized watercraft if the motor has been completely shut off and its progress from the motor has ceased."
It is prohibited to:
"get out of a motor vehicle along a public road and shoot a bow or firearm unless you are at least 25 yards from the vehicle."
Or
"Hunt or shoot at wild animals or birds from an airborne conveyance, from a vehicle or other land conveyance, from a motor-driven water conveyance, or from or across a public road, unless specifically authorized to do so by law or regulation. You may shoot from a motorized watercraft if the motor has been completely shut off and its progress from the motor has ceased."