bikes versus motorcycles

I thought these pics from today's TdF stage were pretty cool. The pics were obviously taken at the same corner and the motorcycle is throwing sparks going through the corner. Obviously we don't know the relative speeds but typically the motorcycles are either leading or following the cyclists and going roughly the same speeds. I wish they would play more sound during the races because its cool to hear the cars squealing their tires to follow the bicycles down the mountains.