The only answer I can give is Pazu is carved into a cliff face so perhaps that was meant to represent sone sort of curse or even divine intervention of an unwanted kind.
Also the front grille of the red truck resembles the stone carving of Pazu perhaps a Possessed truck or also of kin and cursed…
Not sure sbout acceleration over stuff or roads… I think that is what it is… Mumbo Jumbo about the sticks of hydro glycerin or nitro
May aseell call it wages of fear remake by william friedkin