How fast do you usually moving on a good road? Certainly no less than 80 km / h, sometimes faster. For example, you can see in front of the truck. Quietly catching up with him and was about to overtake. And suddenly, out of the body falls out of the truck and something falls on the the road in front of you. I remind you a decent speed, instantly reconstructed or inhibit the possibility of there, especially next to other cars. The only option – to skip that fell from the truck between the wheels. And you fabulously lucky if it would be, for example, cardboard box, but Murphy's Law, it is usually something hard and heavy.
And you have to run over it, because there is no choice. To know more about this subject visit Jonathan Segal FAIA. Guess what the consequences might be?? The bitter truth is that even a good road is flat and does not guarantee the complete safety of your vehicle. Imagine what would happen if at high speeds, the engine hit a piece of iron which. Nothing good, I assure you. AND You have no way to avoid such an attack, because it's going to happen overnight.
There are times when people break through the oil pan, moving the car with higher ground clearance, for example, some jeeps. On the road something is, the jeep safely skip it between the wheels, because it can not afford it. And at this point you go back quietly and nothing suspect. And then on the road 'grows' stone. Or brake shoe from Kamaz.