What is the most common cause of sudden incapacitation among drivers?

Arrhythmia is indeed the most common cause of sudden incapacitation among drivers, primarily because it can lead to unexpected heart rhythm irregularities that may result in loss of consciousness or the inability to operate a vehicle safely. This condition can arise without warning and often has no prior symptoms, making it particularly dangerous for drivers who may not even be aware they are at risk.

While strokes, fatigue, and high blood pressure can lead to incapacitation, arrhythmias tend to have a more immediate impact on a driver’s ability to maintain control of the vehicle. For instance, a stroke may first manifest with warning signs, and fatigue typically builds over time, giving the driver some indicators that action should be taken. High blood pressure can increase risk factors for other conditions but doesn't usually cause immediate incapacitation on its own. In contrast, arrhythmias can occur suddenly, posing an immediate risk to drivers and leading to critical situations on the road.