Paris-Roubaix race director Thierry Gouvenou has named increased speed as one reason for a growing number of crashes at major cycling races. “Stop, stop, stop, let uns end the massacre. Let’s start to think about the speed problems,” Gouvenou told sports paper L’Equipe ahead of Sunday’s edition of his race. “We’ve made enormous progress in aerodynamics and braking. We’re going far too fast.” Gouvenou spoke after a heavy crash in the Itzulia Basque Country stage race where Tour France champion Jonas Vingegaard and Remco Evenepoel were among casualties in a mass crash on Thursday and suffered fr…