A network computer system can associate an operator with a mobile device. Additionally, the network computer system can determine a current location of a freight vehicle operated by the operator, using location information transmitted by the mobile device associated with the operator. At a given instance, the network computer system can determine a time of arrival for the freight vehicle to arrive at a given destination location based on various parameters. For example, the time of arrival can be based at least in part, on (i) a distance between the current location of the freight vehicle to the given destination location, (ii) a time for the freight vehicle to travel the distance, and (iii) a duration of one or more required downtime intervals during which one or more restrictions are placed on the operator operating the freight vehicle.