Don´t underestimate the "T Models". It´s a T2, and the one in the Vid is a T1,5, but you never know what engine it has in the Back...
Watch this (1:00 gets interesting). http://www.youtube.com/watch?v=VYxVI9RE7Hc
6th of April was a Tuesday this is why you have seen only cars at the gate to the ring in the evening hours. AFAIK the Ring is opened every Sunday the "whole" day for public traffic if there´s no race on the Ring. And on Weekdays it´s often rented by car manufacturers (I think they call it "Industrietage" / Industry Days)