The sad reality is if the driver passes out or has a seizure, by time the passenger realizes it and reacts it will probably be too late.
A co worker of mine was in a horrific accident years ago, when he was driving a semi loaded with logs. He was just meeting a VW Van that started to swerve and it came right into the side of him. He tried to take evasive action and was already in the ditch when the van hit him.
He said he seen the driver slumped over the wheel and his wife's terrified expression before impact. The man had died of a heart attack and the woman died instantly upon impact. He said it happened so fast but yet seemed an eternity. He has never forgot the horror of it all.
If you have serious medical issues or are not feeling well DON'T DRIVE.
