What can a leaking exhaust system cause while driving?

A leaking exhaust system can lead to the accumulation of harmful gases, such as carbon monoxide, inside the vehicle. When these gases enter the cabin, they can cause drowsiness or fatigue for the driver and passengers. This is particularly dangerous, as drowsiness impairs the driver's ability to concentrate and respond quickly to road conditions, significantly increasing the risk of an accident.

In contrast, the other options inaccurately suggest benefits that do not arise from a leaking exhaust. Improved fuel efficiency, increased passenger comfort, and enhanced vehicle performance are not outcomes of a problematic exhaust system. In fact, a leak typically results in decreased engine efficiency, potential discomfort inside the vehicle due to noise or fumes, and negative impacts on overall vehicle performance. Thus, recognizing the risks associated with a leaking exhaust system is crucial for safe driving.