Does anyone know if the Green Card (Third Party Liability) insurance which needs to be purchased at the Debeli Brijeg border, cover also countries other than Montenegro? Or is it only covering Montenegro?
I am not sure this advice is correct. I asked at an insurance company in Herceg Novi, they said it only covered a foreign vehicle for Montenegro. A green card issued to a Montenegrin registration, covers all other countries..  This can cause a problem when crossing Bosnia to U.K.
I presume if you want to drive the car only in Montenegro than the green card at the border crossing will do .I would suggest buying the green card in your own country. The authorities that you buy the green card from will tell you what countries it is required for. When I register my own car in Montenegro I pay a bit extra to get the green card and this covers me for driving in Bosnia and Croatia.