If you drive a vehicle on public roads, you need this information. If you are a truck driver or a bus driver and operate a commercial vehicle to earn a living, this handbook is 'must have' knowledge. An OTR driver is particularly prone to irregular sleep patterns, will frequently physically reflect a 'truck stop diet' or be at least somewhat overweight and void of a quality level of fitness, and is still highly likely to be a smoker. All of that and more is consistent with developing a sleep disorder, especially sleep apnea. What comes first...heart disease, stroke, diabetes, hypertension,...