Notwithstanding any other provision of any law or any rule or
regulation of a State or any political subdivision thereof, any
person who is not otherwise prohibited by this chapter from
transporting, shipping, or receiving a firearm
As long as you're legally allowed to have your firearm, and where you are going to/coming from allow firearms...
shall be entitled to
transport a firearm for any lawful purpose from any place where he
may lawfully possess and carry such firearm to any other place
where he may lawfully possess and carry such firearm if, during
such transportation the firearm is unloaded, and neither the
firearm nor any ammunition being transported is readily accessible
or is directly accessible from the passenger compartment of such
transporting vehicle:
...You may have your weapon in your car as long as neither it nor ammunition is readily available, and it is unloaded
Provided, That in the case of a vehicle
without a compartment separate from the driver's compartment the
firearm or ammunition shall be contained in a locked container
You may keep it in the trunk, if you don't have a trunk and it is in the same compartment as you, it must be in a locked container.