When we travel abroad it is usual to carry the necessary vehicle and insurance documents to ensure that we have full identification and cover. It is worth noting that in Spain, France and Italy it is almost mandatory for motorists to also carry a 'European Accident Statement' which can be used in case of an accident, to record on the spot, the details for insurance purposes. It is usual for the form to be completed and then the third party asked to complete that section and sign it. Once complete the document has a legal implication and can be used by the insurance company. The form will be in which ever language is relevant to the country and may be difficult to understand by you as to what has been said. If this is the case I advise that you don't sign it although I have heard occasions recently when there has been great pressure mounted by the other party to complete it on the spot.
The form is known as Constat Amiable in France, CIA in Italy and DAA in Spain and I understand a number of other countries are introducing similar statement forms. It is possible to download an English version of this standard form which would be useful in assistnce with this procedure. Available at http://european-accident-statement.accidentsketch.co.uk/ More information is also available from the RAC in their document about driving abroad :- http://rac.co.uk/pdfs/report-on-motoring/driving-abroad-report.aspx