Ill or fatigued operator

§ 509-k. Ill or fatigued operator. No driver shall operate a bus and a\nmotor carrier shall not permit a driver to operate a bus while the\ndriver's ability or alertness is so impaired, or so likely to become\nimpaired, through fatigue, illness or any other cause, as to make it\nunsafe for such driver to begin or continue to operate the bus. At the\nrequest of the driver or the motor carrier such illness, fatigue, or\nother cause shall be certified by a qualified physician or nurse\npractitioner. However, in a case of grave emergency where the hazard to\noccupants of the bus or other users of the highway would be increased by\ncompliance with this section, the driver may continue to operate the bus\nto the nearest place at which that hazard is removed.\n