system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why do some UPS/USPS workers go far enough to leave a missed package slip on a door, but refuse to ring the bell so that someone might actually pick the package up?
gpt
Telematics.

UPS trucks and the like are laden with sensors that record everything from GPS location to whether or not the driver's seat belt is buckled. This includes how long the truck is stopped to make a delivery. It behooves the driver to be as quick as possible with each delivery since they are being measured and graded with all the data that is collected. Quicker deliveries means more deliveries in a shift and therefore improved "efficiency" and cost effectiveness.