There are unforeseen displacements of the steering control details and joints or the threaded connections are not stretched.
There is no fire extinguisher in the truck.
In both cases.✓Bonne réponse
Explication
Steering joints must not shift unexpectedly, and their threaded fasteners must be properly tightened, because looseness can cause loss of directional control. A truck must also carry its required fire extinguisher, so either condition is enough to prohibit operation.