What should a driver do if they smell exhaust fumes inside the cab?

When a driver smells exhaust fumes inside the cab, it is crucial to address the issue promptly due to the potential health risks associated with carbon monoxide and other harmful exhaust gases. Opening the cab windows provides immediate ventilation, allowing fresh air to circulate and reducing the concentration of toxic fumes inside the vehicle. This action helps to safeguard the driver's health while further investigating the source of the exhaust smell.

Continuing to drive while ignoring the fumes can lead to serious health hazards, including dizziness, nausea, or even loss of consciousness. Checking the engine immediately may be necessary as a follow-up action, but the immediate response should prioritize the driver's safety and well-being. Turning on the air conditioning might not be effective since the system could draw exhaust fumes in from the outside, particularly if there is a leak or issue in the vehicle. Hence, opening the windows serves as the most effective initial response to mitigate the danger posed by the exhaust fumes.