Overloading trucks will seriously damage highway facilities and pose a serious threat to the safety of highway bridges. Please explain from two aspects: Why are vehicles overloaded?

Answer: (1) If the vehicle is overloaded, the road pressure will increase. When the stress area is almost unchanged, the pressure on the pavement will increase, thus accelerating the pavement damage;

(2) The vehicle is overloaded and the pavement pressure increases. When the roughness of the contact surface is constant, the friction on the pavement will increase, thus accelerating the pavement damage.