2. SYSTEM OF LOCKING a. Doors and all other locking devices on vehicles shall be made in such a way that sealing by the Customs may be done easily and effectively. b. The doors shall be constructed in such a way as to cover all interstice and to assure that closing is complete and effective. c. Adequate protection shall be provided for Customs seals, or the vehicle shall be constructed in such a way that Customs seals may have sufficient protection. 3. SPECIFIC TYPES OF VEHICLES The above mentioned provisions concern sothermique vehicles, cooling and refrigerated vehicles, as well as tankers. Powder horns (locking covers), valves and safety valves, and manholes of tankers, shall be built in a way that sealing may be undertaken simply and effectively. 4. TARPAULIN COVERED VEHICLES, VANS Tarpaulin covered vehicles shall be treated under the provisions of Article 2. Such vehicles shall in addition comply with the following specifications : The tarpaulin shall be made either from tough canvas non-stretchable or from material covered with nonstretchable and sufficiently resistant plastic or rubber material. It must be in good condition and made in such a way that, once the lock is in place, the cargo cannot be tampered with without visible traces being left behind. Connecting rings shall be fixed in such a way that they cannot be detached from the exterior. The eyeletholes of the tarpaulin shall be reinforced with metal or with leather. The tarpaulin shall be attached to the wall of the vehicle in such a way as to prevent any possible access to the cargo. It will be supported by ring bows. The following items may be used for closing purposes : a. Steel cables b. Sisal or hemproptes c. Iron bars. Provision shall be made on the extremity of closing appliance for affixing customs seals. 5. The axle loads and dimensions of vehicles admissible for Inter-States Transit of Goods shall not exceed the maximum loads and dimensions stipulated in the Inter-States Road Transport Convention. 6. CONTAINERS a. Within the provisions of the Inter-States Road Transportation of merchandise under Customs seal, only containers bearing the following permanent identification marks shall be permitted to operate under this Convention : the name and address of its owner, as well as an identification of the weight, the mark and number. Such container shall be constructed and fitted out in the following manner : • • • to allow for easy and effective sealing, no merchandise can be extracted or introduced without leaving traces or breaking the seal, having no closets where goods could be hidden. b. The container shall be made in such a way that any space such as compartments, receptacles or any other closet capable of containing merchandise shall be easily accessible to customs officials.