Yes, this is two wheels, not four, but it's two that makes four. Just watch:
Somebody turn a hose on those two cycles,
quick! (And no, I don't know why there's Bugs Bunny performing
square-dance music on there. Just bow to your partner and roll with it.)
As the YouTube comments tell us, this wreck
was "Sur le circuit de Magny-Cours, épreuve du championnat Promosport :
deux pilotes chutent et leurs motos s'entremêlent et continuent de
tourner au sol!" Exactly what I was thinking.
For those of you who don't read French, our handy Yahoo! BabelFish translator
(didn't know we had that, did you? Corporate synergy!) says that means
"On the circuit of Magny-Course, test of the Promosport championship:
two pilots fall and their motor bikes intermingle and continue to turn
on the ground!" The French: masters of the obvious.