The data was obtained through a Freedom of Information request made by TomKearney, a cyclist who suffered life-threatening injuries after being struck by a bus in Oxford Street in December 2009.
The quartet of Leinster players - O'Driscoll, Rob Kearney, Luke Fitzgerald and Jamie Heaslip - plus Leicester's Tom Croft and Harry Ellis and Northampton prop Euan Murray were rested for the opening match after their exertions last weekend.