Systems and methods using geographic coordinates for item delivery

An item delivery system comprising:

• an autonomous delivery vehicle comprising,
• a vector calculation module configured to determine a motion vector associated with the autonomous delivery vehicle
• a GPS module configured to determine a geo-location of the autonomous delivery vehicle as the autonomous delivery vehicle traverses a delivery route;
• a geo-fence database configured to store geo-fence information for a plurality of delivery points on the delivery route, the geo-fence information comprising an initial geo-fence surrounding each of the plurality of delivery points;
• and
• one or more processors configured to:
• identify, based on the motion vector and the geo-location, a plurality of geo-fences of the delivery route the autonomous delivery vehicle is approaching;
• retrieve, from the GPS module, breadcrumb data for the autonomous delivery vehicle;
• modify, based on the motion vector and the breadcrumb data, the initial geo-fence surrounding one of the plurality of delivery points to generate a modified geo-fence, the modified geo-fence having a different size than the initial geo-fence;
• determine that the autonomous delivery vehicle has entered the modified geo-fence surrounding the one of the plurality of delivery points;
• determine that a package is to be delivered to the delivery point whose modified geo-fence the autonomous delivery vehicle has entered;
• and
• cause the autonomous delivery vehicle to slow down in response to determining that the autonomous delivery vehicle has entered the modified geofence and that there is a package to be delivered to the delivery point.