Carnage Q

Is it just me (and Mars) - or anyone else think those cars in flames given the carnage on the 11th (see pictures on post below) quite puzzling? Am confused how several vehicles, caught fire? It seems they were up in flames on impact or something? The flames seem to be on the cars, and not spread across the highway - which should be the case perhaps given leaking petrol?

Am I missing something? Thoughts appreciated.