(1) Written permission must be obtained from the authority at least two days before intended travel over the vehicular crossing.

(2) If permission to use the vehicular crossing is granted by the authority, passage may be made only on the specific day and within such hours as are stipulated by the authority. Vehicles and their loads requiring special handling will be subject to any and all costs, in addition to the regular tolls, for such special handling. Provided, however, common, contract and private carriers transporting radioisotopes used for medical, industrial, agricultural, or research purposes; natural uranium metal, depleted uranium, magnesium-thorium alloys in formed shapes (not powered, and which shall contain not more than four per cent nominal thorium 232); radium or radon sealed in needles, capsules, or similar platinum-invidium or gold containers used for medical purposes; manufactured articles other than liquids, containing radioactive material as component parts, namely, clock and instrument dials, electronic tubes, test instruments, X-ray machines; packaged, marked, labeled and limited as required by the I.C.C. regulations in a properly placarded vehicle, may use the vehicular crossing without prior notice or time restriction.

(3) Vehicles transporting Class A or B explosives, or radioactive materials, their contents and shipping documents shall be subject to inspection by a bridge employee prior to proceeding over the vehicular crossing.

(4) Operators of vehicles transporting Class A or B explosives, or radioactive materials must comply with all orders, instructions and directives of a bridge employee.

(5) Vehicles transporting Class A or B explosives, or radioactive materials, whether halted or in motion, must remain at least 300 feet from any vehicle traveling in the same direction while crossing the bridge.