Sindroms, there is no way, that EVERY gravel path (sometimes its hard to call them roads) will be closed. Some of them yes, but not every single one. You can give them a try, but my advice is that u should do some research. And not only with map, but also with Google maps cause to be honest, some of those roads are undrivable. Of course best way is to drive stages earlier and find some roads, but ofc not everybody can do this.