In VehicleRoutingImporter.createVehicleList() method, all vehicles are being set to the first depot.

vehicle.setDepot(depotList.get(0));

For example, if I put 10 depots in the file belgium-road-time-tw-n100-k10.vrp all vehicles would still start from the first Depot. So, instead of hard coding to the first depot from the DepotList, if the number of vehicles matches the number of depots, adding one vehicle to each depot might be more useful.