What is the most likely cause of sudden incapacitation in drivers?

Sudden incapacitation in drivers can often be attributed to arrhythmias, which are irregular heartbeats that can disrupt the heart's ability to pump blood effectively. When a driver experiences an arrhythmia, particularly a severe or life-threatening type such as ventricular fibrillation, they may lose consciousness very quickly and without warning. This loss of consciousness can prevent the driver from maintaining control of the vehicle, leading to potentially catastrophic consequences.

While conditions like high blood pressure, heart attacks, and severe anxiety can also impair driving ability, they do not necessarily cause immediate incapacitation in the way that arrhythmias can. High blood pressure may lead to long-term health issues or complications, but it is less likely to cause sudden loss of control. Heart attacks can result in incapacitation but often present with warning signs beforehand. Severe anxiety can cause panic and distress, which may affect concentration and control but typically does not result in a sudden loss of consciousness. Thus, arrhythmias are the most definitive cause of sudden incapacitation in this context.