How Dangerous Is Driving While Tired?
Driving while fatigued is often compared to drunk driving because it affects the body similarly. Like
alcohol, being tired can reduce a person’s reaction time, awareness, judgment, and coordination —
all skills that are essential for safe driving. If he or she dozes off behind the wheel, the
consequences can be life-changing.
A study conducted by the
AAA Foundation of Traffic Safety concluded that drowsiness is a factor in as
many as 10 percent of all accidents across the country and may be responsible for as many as 21
percent of all
fatal traffic collisions.
In addition, AAA found that getting less than seven hours of sleep significantly increases the
chances that a person will be involved in a motor vehicle accident. But nearly one third of
Americans get six hours of sleep per night or less, according to a recent
survey
in the journal
Sleep. That means we’re surrounded by many, many fatigued drivers every day.
Getting only five to six hours of sleep can double a driver’s chances of causing a car accident. It’s
also the equivalent of
driving with a blood alcohol concentration (BAC)
just above the legal limit
of 0.08 percent. The degree of impairment worsens as sleep deprivation increases. For example,
driving on less than four hours of sleep makes the risk of a crash as much as 11.5 times higher,
equivalent to a driver with a BAC of .12 to .15 percent.