I have watched the start and finish at Mulsanne for the last 6 years and would not recommend it at all. There are hardly any people there, so getting a drink at the bar is too easy, parking is too easy and it is too easy to enjoy a comfortable pre race picnic in the shade of the car park prior to a short walk (slash in the woods on the way) to the corner where you get a tediously uninterrupted view of the race without having to stand up. Take my advice, it’s for old men and wimps like me don't go there. Please.
