Excerpts from the Preface: This is a revision of handbook No. 669 published in 1987. It superseded Agriculture Handbook No. 105, "Protecting Perishable Foods During Transport by Motortruck," first published in 1956 and revised in 1970. These handbooks have been extremely popular, and tens of thousands of copies have been distributed worldwide. This updated edition reflects the dynamic changes and innovations in the handling and transportation of perishable foods. Some of these are the rapid change from handstacked loads to unitized loads on pallets and slipsheets, the use of microprocessors for more efficient refrigeration, and the use of satellites to monitor and control the performance of refrigerated vehicles during transit.