The tracking part is more telemetry for their delivery optimization algorithm. (Think the classic traveling salesman problem.) For example, UPS drivers are generally prohibited from making left turns because it's considered less efficient to do so.
UPS drivers are personally held responsible for packages placed in their custody.
> For example, UPS drivers are generally prohibited from making left turns because it's considered less efficient to do so.
No, they aren’t “generally prohibited from making left turns” - that’s a misrepresentation. The truth is that their routing-engine is optimised for reducing idle time waiting at lights which meant that _consequently_ their navigation+routing instructions given to the driver will avoid left-turns. That’s all it is.
(When the media references this they make it sound like eliminating left-turns is the objective, rather than the end-result)
It's definitely used for checking and evidence of delivery. For instance, GPS coordinates are logged when parcels is marked as delivered so that know exactly where this happened, not only when.
UPS drivers are personally held responsible for packages placed in their custody.