Eddy I was there on Saturday, and it did work .
However Brands Indy is quite short and you can see a fair bit of the track as you drive round so that helps.
Take a track like Spa and throw in a great speed difference in classes , things don't work out as well. I lost a complete lap behind a car a couple of years back because he was going considerably slower than the pace car. OK I am no slouch at this track, but to make up 3 + mins !
Either some drivers don't understand the rules or are only there to "drive round" and not actually race IMHO