in the cases referred to in 1.1.4.5.1 above, the involved adr contracting parties may agree to apply the requirements of adr to the section of a journey where a vehicle is conveyed otherwise than by road haulage, supplemented, if they consider it necessary, by additional requirements, unless such agreements between the involved adr contracting parties would contravene clauses of the international conventions governing the carriage of dangerous goods by the mode of transport used for conveying the road vehicle on the said section of the journey, e.g. the international convention for the safety of life at sea (solas), to which these adr contacting parties would also be contracting parties.
these agreements shall be notified by the contracting party which has taken the initiative thereof to the secretariat of the united nations economic commission for europe which shall bring them to the attention of the contracting parties.