Disengagement rates out of context don't indicate much. Going 10,000 miles up and down a lonely stretch of highway without an unplanned disengagement makes for

Disengagement rates out of context don't indicate much. Going 10,000 miles up and down a lonely stretch of highway without an unplanned disengagement makes for a pretty number, but is worth less than going a mile in dense urban traffic with cyclists, pedestrians, left turns through busy uncontrolled intersections, double parked vehicles etc.