a truck that was transporting flammable substances wasn't driven by an attentive trucker, collided with stopped traffic, and exploded with enough force to blow a hole into the freeway on a highway near the airport on the outskirts of Bologna, Italy,

and that is why fuel tankers are driven by people that are FAR MORE careful about how much space they WILL KEEP in front of them, and drive slow, so they NEVER crash into anything.

10,000 gallons, for example, of flammable liquid, weighs 80,000 pounds, roughly. Brakes are not going to slow down that truck, not 40 tons of it, in an emergency

https://www.mercurynews.com/2018/08/06/two-dead-in-massive-gas-truck-explosion-in-italy/