1. A CONVEYOR COMPRISING A MAIN PATH, A PLURALITY OF AUXILIARY PATHS SHUNTED ACROSS SAID MAIN PATH AND FORMING LOOPED CIRCUITS WITH THE SAME, SAID AUXILIARY PATHS BEING CONNECTED TO SAID MAIN PATH BY POINTS AT THEIR ENTRY AND BY A JUNCTION AT THEIR EXIT, ROUTABLE CARRIAGES, SYNCHRONOUS DRIVING CHAINS ADAPTED TO DRIVE SAID CARRIAGES ALONG SAID MAIN AND AUXILIARY PATHS, A LOADING STATION ON SAID MAIN PATH, LOADING AND UNLOADING STATIONS ON EACH AUXILIARY PATH, EACH LOADING AND UNLOADING STATION HAVING ON EACH SIDE AN UPSTREAM STORAGE ZONE AND A DOWNSTREAM STORAGE ZONE OF EQUAL CAPACITY WHEREIN SAID CARRIAGES MAY BE DISENGAGED FROM SAID DRIVING CHAINS, BLOCKING MEANS OF SAID CARRIAGES AT THE EXIT OF SAID STORAGE ZONES, MEANS FOR DETECTING THE PRESENCE OF AT LEAST ONE CARRIAGE IN EACH OF SAID DOWNSTREAM STORAGE ZONES, MEANS FOR RELEASING A CARRIAGE FROM SAID DOWNSTREAM STTORAGE ZONE, ROUTE DETECTORS DISPOSED CLOSE BEFORE SAID ENTRY POINTS, MEANS FOR CONTROLLING SAID ENTRY POINTS IN ORDER TO ACTUALIZE THE ROUTING OF SAID CARRIAGES, SAID ROUTE DETECTOR AND SAID CARRIAGE PRESENCE DETECTING MEANS BEING SO ASSOCIATED AS SIMULTANEOUSLY TO CONTROL SAID MEANS FOR CONTROLLING SAID ENTRY POINTS AND SAID MEANS FOR RELEASING A CARRIAGE FROM SAID DOWNSTREAM STORAGE ZONE, THE SWITCHING OF A GIVEN CARRIAGE TO A GIVEN AUXILIARY PATH BEING ONLY CONDITIONED BY THE PRESENCE OF AT LEAST ONE CARRIAGE IN THE DOWNSTREAM STORAGE ZONE OF SAID GIVEN AUXILIARY PATH, WHEREBY ALL THE CARRIAGES TRAVEL AROUND SAID MAIN PATH UNTIL A CARRIAGE IS PRESENT IN THE DOWNSTREAM STORAGE ZONE OF THE LOADING AND UNLOADING STATION FOR WHICH THEY ARE ROUTED AT THE TIME WHEN THEY PASS TO THE ENTRY OF THE POINTS FOR THE CORRESPONDING AUXILIARY PATH.