Why should drivers avoid foreign objects in the road?

Foreign objects:
Things that have fallen on the road can be hazards. They can be a danger to your tires and wheel rims, damage electrical and brake lines, or become caught between dual tires and cause severe damage. Some obstacles that can appear to be harmless can be very dangerous. For example, cardboard boxes may be empty, but they also may contain solid or heavy material capable of causing damage. The same is true of paper and cloth sacks. Remain alert for objects of all sorts, so you avoid them without making sudden, unsafe moves.