A method for parcel delivery service that permits secure and timely delivery of items to unattended vehicles. The method includes receiving an order to deliver an item to a vehicle. A current location of the vehicle may be determined using vehicle identification information. After the vehicle has been located, the item may be authenticated at the vehicle, and access to the interior of the vehicle may be automatically provided to enable the vehicle to securely receive the item. A corresponding system is also disclosed and claimed herein.