German Cross Border Rentals & Territorial Restrictions
Cross Border Rentals & Territorial Restrictions
Cross Border Rentals are allowed to the following countries - inclusive islands:
Andorra, Austria, Belgium, Denmark, Finland, France, Gibraltar, Great Britain, Ireland, Italy, Liechtenstein, Luxembourg, Monaco, Netherlands, Norway, Portugal, San Marino, Spain, Sweden, Switzerland, Vatikan City.
Cross Border Rentals are allowed to the following countries but not with Audi, BMW, Mercedes-Benz, VW, Porsche and all Jeeps/Offroader:
Croatia, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Slovakia, Slovenia.
It is allowed to enter the last-mentioned countries with all vehicles of car groups IVMR, SVMR and FVMR (including Mercedes-Benz Vito, Mercedes-Benz Viano), vans and trucks.
In case of offence against Cross Border & Territorial Restrictions all insurances lose their validity.
Seems like not only is it against the rental agreement, it could also be against the law (operating without insurance).
As SteamyUncle suggested, start your rental in Austria as they allow going into Slovakia for a fee. Your friends may also consider getting themselves into Vienna and you pick them up from there if you have a German rental.