Loaded firearms in motor vehicles: It is unlawful to have a loaded firearm or crossbow in or on a motor vehicle (including trailer, ATV, aircraft, snowmobile, or railway car). A loaded clip may be carried in a motor vehicle, but it must not be inserted in a firearm. Persons who hold a Maine concealed firearms permit may carry a loaded pistol or revolver in a motor vehicle.
Firearms may be transported in a motor vehicle without a concealed firearms permit provided they are (1) unloaded and in plain view, or (2) are unloaded and placed in a remote secure area (such as a locked trunk) away from the control of the occupants of the motor vehicle. For purposes of this law, a muzzle-loading firearm is considered to be loaded only if charged with powder, lead and a primed ignition device or mechanism. This provision also applies to crossbows.