I watched the video on my phone so couldn't make out if there was signaling or what-not going on when passing. It seemed like everyone got out of Kubica's way. Granted he was the fastest, but what are the rules for yielding?
When he was driving it was TF aka Turist Fahren aka PUBLIC ROAD RULES, same as autobahn.
Only passing on left, and no racing, no cutting people off etc. You dont have to signal for people to pass you, but I prefer when they do, because then I know they have seen you. Ironicly I prefer slightly motorweak veichles on the nurburgring 200-400hp range is the most fun, my regular track car is just to much power and its very hard to get good flow. especially on TF with say a 250HP hatchbank FWD, an experiencet driver will still be fater than 99% of the people out there. Onyl roadlegal cars, only road legal tires etc
There are private trackdays as well where there is pasing on inside and bsicly racecar rules... say you are doing what you think is superfast, but when GT1/GT2/GT3 class actual racecars comes hauling fast on big aero + slicks... your not fast.
Hes driving with misha, so they both "knew" each other, or at least of each other
For kubica to drive the nurburgring its like a worldcup ski athlete on a new hill, they will be crushing everyone else, eventhough they have never seen it, and for them are just having some freeskiiing fun. He has also sim raced it, so only thing he was missing is the on/offcamber and heigh/steepness of sections, and how the surface feels.