What is a common consequence of exceeding weight limits on axles?

Exceeding weight limits on axles can lead to tire blowouts, which is a serious safety concern for truck drivers and other motorists. When a vehicle carries too much weight on its axles, it places excessive pressure on the tires. This additional pressure can cause the tires to overheat as they rotate, which increases the likelihood of structural failure. A blowout can happen suddenly and without warning, potentially causing the driver to lose control of the vehicle, leading to accidents or damage to the load being transported.

In contrast, the other options suggest outcomes that do not align with the implications of exceeding weight limits. For instance, enhanced braking capability, increased fuel efficiency, and reduced engine wear would all imply beneficial effects, which are not associated with overloading. Instead, overloading generally leads to reduced braking effectiveness, decreased fuel efficiency due to engine strain, and increased wear and tear on various vehicle components, including the engine itself. Thus, tire blowouts represent a direct and dangerous consequence of exceeding weight limits.