The LMP1 coupes of Le Mans, the World Endurance Championship [in the US at COTA in Sept], and March 16 as a guest at the ALMS Sebring 12 have a visibility problem with their high front fenders and huge A-Pillars.
The 2014 ACO / FIA rules will fix it a bit - raising the cockpit height, increasing windshield size, reducing the front fender size.
But, Audi can't wait so for 2014. So, they mounted a forward-looking periscope. This article explains 'Das Boot' better [....than Ferrari explained LaFerrari].