Hi Luis:

Cyclopathic's commend about heavy traffic on the coast road in Croatia is worth noting. It is a busy road with a lot of tourist traffic - lots of campers and trailers (caravans). So don't expect to make good time on that road. Having said that, it is a very beautiful road to ride on, so it's not really a problem that traffic moves slowly.

Concerning insurance, the best advice I can give you is to check with your present insurance company in your home country and see if they can provide you with extended coverage for some of the former Yugoslavian countries. Otherwise, you will need to buy insurance at each border crossing. Country-specific insurance is normally sold in 7 day, 10 day, or 14 day blocks (it varies from country to country) and it can be a little frustrating to have to buy a two-week policy when you only plan to spend a day in a country... but that's just the way it is.

Here's a link to a post I made back in 2015 to provide details about how insurance works in all the former Yugoslavian countries: Balkans Insurance - Here's the story, with details & sample documents. That post is 6 years old, so the prices may have changed, but the general concepts are still the same.

FYI, the further south you go along the Adriatic coast, the less expensive things get. It's a linear decrease from Slovenia (pretty much the same prices as Austria or Germany) all the way down to Albania (ridiculously cheap, and a very pleasant country to ride in).

Michael