My previous post has obviously been misconstrued by later posters, nowhere did I state that it would be a good idea to run around the course during TT or MGP. This would definitely not be recommended and I would be the first to condemn anyone stupid enough to try it.
The question was "would it be possible to run around the course?" To which the answer is yes, but just do it in one of the other fourth eight weeks of the year.

My other point was simply that Desmo says that he wouldn't even ride around the course during race fortnight, unbelievable. The roads are a lot safer now than back in the 80's, there were loads more bikes over for TT than there are nowadays, mountain was two way (apart from Mad Sunday), just added to the buzz.