UPS has business and warehouse stops to tend to, makes up half of our pickups and deliveries. Many times drivers must break off, so those 10 stops Amazon gives you wouldn’t work for UPS. The UPS driver may need to split for a misload, an on-demand pickup or a reroute.
https://www.reddit.com/r/UPS/comments/qxhnb1/the_follow_my_delivery_live_on_map_feature/

