To reduce lead time in delivery, reducing the load they have to carry, the distance they have to walk, and the time they have to spend parking and driving, self-driving trucks could help carriers to deliver. Carriers can collect mail while the self-driving truck drives itself for the next delivery or walking relay. Through saving time on each delivery or other activities, routes will be completed more efficiently, allowing the Postal Service to integrate routes or provide additional services such as postal service, government services or other miscellaneous services