If a driver becomes too ill to drive safely, what is the correct response?

Explanation

A driver who becomes too ill to drive safely should stop and pull off the road as soon as it can be done safely, since illness affects a driver's ability to safely operate a vehicle the same way fatigue or impairment does. 49 CFR 383.111(a)(1)(iii) specifically names "the effects of fatigue, poor vision, hearing impairment, and general health" upon safe operation as required knowledge, but does not itself state this stop-and-pull-over response, so it is standard driver-training content, attributed to the manual. The wrong options each keep the vehicle moving when it should not be: pushing on to the next stop or merely adding following distance both leave an impaired driver in control of the vehicle, and whether an illness later turns out to be contagious has nothing to do with whether it is currently unsafe to keep driving.

Source: 49 CFR 383.111(a)(1)(iii)