(1) If dangerous goods are to be carried, the sender is to inform the carrier, in good time and in text form, of the precise nature of the danger and, if necessary, of the precautionary measures to be taken.
(2) Unless, when taking over the goods, the carrier knew of the nature of the danger or had at least been informed of it, the carrier may
1. unload, store or return dangerous goods or, to the extent necessary, destroy them or render them harmless without becoming liable in damages to the sender, and
2. claim reimbursement from the sender for any expenditures necessarily incurred in carrying out these measures.