A method and system for controlling unloading of a vehicle transporting a load of unprocessed material from a first location to a second location are described, wherein the second location includes a material processing device and a storage for unprocessed material. The method includes receiving a signal indicative of a level of unprocessed material contained in the material processing device; determining, based on the signal, whether an estimated level of unprocessed material contained in the material processing device is below or above a threshold at an estimated time of arrival of the vehicle at the material processing device; and, directing the vehicle towards the material processing device when the estimated level of unprocessed material contained in the material processing device is below the first threshold; or directing the vehicle towards the storage when the estimated level of unprocessed material contained in the material processing device is above the first threshold.