sentences:  It is possible to do this by designating a location, say a marked floor area, to be the 'virtual' truck and moving items from the market to the 'virtual truck' smoothly over the chosen period prior to the load onto the actual truck commencing.Smoothly here means that for each item its 'loading' is evenly spread across the period.For regular shipments this period might start the moment the last shipment in that schedule departs the loading bay.