Good communications is more than just a two way street where a dispatcher can carry on a conversation with a driver in the field. It also is a way to send data back and forth which can be turned into useful operational information.
Arriving at the agreed upon time at a customer location is more than just important. In many cases, it can be critical as well. Arrive too early and the driver will have to wait for the customer to open or for a dock to become available. Arrive too late and customer may already be closed or unable to accept the delivery.