"Sparks from the breaks ignited gas tanks"
This usually occurs when gasoline is leaking from the tank.
"Sparks from the breaks ignited gas tanks"
"This usually occurs when gasoline is leaking from the tank."
AAAAAAAAAAAA Wrong..
All major buses use diesel fuel. Diesel fuel is harder to ignite than regular fuel. In fact the flash point of diesel fuel in the tank is about 140 degrees Fahrenheit. Compare this to the flash point of regular gasoline in the tank of -35 degrees Fahrenheit.
Since buses typically carry 100 gallons of diesel fuel, if the fuel is ignited, it can be a major catastrophe for the bus, its driver and any passenger vehicles in the area. Most diesel fuel in buses is heated by recirculation through the fuel pump. However, because of the high flash point of this fuel, a large energy source is generally required to ignite even this warm fuel.
Unlike passenger crashes with gasoline, rupture of the fuel tank will probably not ignite the diesel fuel through sparks or a hot exhaust manifold. Of course, if the bus rig is carrying flammable materials a rupture could easily ignite those materials thereby giving the diesel fuel an ignition source.
Absent that scenario, research suggests that the most likely ignition source for a diesel fuel fire in a roll over or collision is the battery box.