← Lessons 27-Permits and Methods of Operating Quiz 0 / 16 read 1. INTRODUCTION 2. ROLL ON/ROLL OFF 3. FREIGHT FORWARDERS 4. CONTAINER TRAFFIC 5. GROUPAGE 6. ROAD/RAIL SYSTEMS 7. THE CHANNEL TUNNEL 8. AUTHORISATIONS 9. UK LICENCE FOR THE COMMUNITY 10. CABOTAGE 11. THIRD COUNTRY TRAFFIC 12. PERMITS 13. CONCLUSION 14. REVISION SUMMARY 15. Quick Exam Numbers / Facts – Memorise These 16.Final Memory Checklist 4. CONTAINER TRAFFIC Containerisation using ISO dimensions developed rapidly from the 1960s. Standard ISO containers are based on 8 ft width and 8 ft height, with common lengths of 20, 30 or 40 ft. Hi-cube containers have become more common and are 9 ft 6 in high. Capacity is commonly expressed in TEUs – Twenty Foot Equivalent Units. Container types include general purpose, insulated, refrigerated, half-height, tank and bulk powder containers. Advantages: Less packaging required. Reduced pilferage. Goods can be cleared at customers' premises. Permits should not normally be required. Potential disadvantages: Limited flexibility for awkward-sized or awkward-shaped consignments. The container is outside the sender's direct control. Road trailers need suitable twistlocks and other equipment for safe container transport. Imported containers may be overloaded for carriage by road in the UK.