Testing developmental prototypes can be tricky. Just ask the guy who crashed that Mercedes-Benz
SLS AMG Black Series prototype at the Nurburgring
. Sure, the factory test pilots and development engineers are possessed of enormous driving talent - many companies requiring that their staff be recertified in advanced driving techniques at regular intervals - but they're not super-human. Especially when the car in question is a mid-engined sportscar and the roads are wet with snow.