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Drunken Driving
Death and injury associated with drinking and driving is
a national tragedy. It’s the number one contributor to the
highway death toll, claiming thousands of victims every
year.
Alcohol affects four things that anyone needs to drive a
vehicle:
Judgment
Muscular Coordination
Vision
Attentiveness
Police records show that almost half of all motor
vehicle-related deaths involve alcohol. In most cases,
these deaths are the result of someone who was drinking
and driving. In recent years, some 18,000 annual motor
vehicle-related deaths have been associated
with the use
of alcohol, with more than
300,000 people injured.
Many adults
-- by some estimates, nearly half the adult
population
-- choose never to drink alcohol, so they
never drive after drinking. For persons under
2 1, it’s
against the law in every U.S. state to drink alcohol.
There are good medical, psychological and
developmental reasons for these laws. The
obvious
way to solve this bghway safety problem
is for people never to
drink alcohol and then drive. But
what
if people do? How much is “too much” if the
driver plans to drive? It’s a lot less than many might
think. Although it depends
on each person and situation,
here is some general information on the problem.
The Blood Alcohol Concentration (BAC) of someone
who is drinking depends upon four things:
0 How much alcohol consumed
0 The drinker’s body weight
0 The amount of food that is consumed before and
during drinking
consume the alcohol
The length of time it .has taken the drinker to
According to the American Medical Association, a
180-pound (82 kg) person who drinks three 12-ounce
(355 ml) bottles of beer in an hour will end up with a
BAC of about
0.06 percent. The person would reach the
same BAC by drinking three 4-ounce
(120 ml) glasses
of wine or three mixed drinks
if each had 1 - 1/2 ounces
(45 ml) of a liquor like whiskey, gin or vodka.
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It’s the amount of alcohol that counts. For example, if
the same person drank three double martinis
(3 ounces
or
90 ml of liquor each) within an hour, the person’s
BAC would be close to
0.12 percent. A person who
consumes food just before or during drinking will have a
somewhat lower BAC level.
There is a gender difference,
too. Women generally have
a lower relative percentage of body water than men.
Since alcohol is carried in body water, this means that a woman generally will reach a higher BAC level than a
man
of her same body weight when each has the same
number
of drinks.
The law in many
U.S. states sets the legal limit at a BAC
of 0.10 percent. In
a growing number of U.S. states, and
throughout Canada, the limit is
0.08 percent. In some
other countries it’s even lower. The BAC limit for all
commercial drivers in the
U.S. is 0.04 percent.
The BAC will be over
0.10 percent after three to six
drinks (in one hour). Of course, as we’ve seen, it
depends on how much alcohol is in the drinks, and how
quickly the person drinks them.
But the ability
to drive is affected well below a BAC
of
0.10 percent. Research shows that the driving skills
of many people are impaired at a BAC approaching
0.05 percent, and that the effects are worse at night. All
drivers are impaired at
BAC levels above 0.05 percent.
Statistics show that the chance of being in a collision
increases sharply for drivers who have a BAG of
0.05 percent or above. A driver with a BAC level of
0.06 percent has doubled his or her chance of having
a collision. At
a BAC level of 0.10 percent, the chance
of this driver having a collision is twelve times greater;
at a level of 0.15 percent, the chance is twenty-five
times greater
!
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The body takes about an hour to rid itself of the alcohol
in one drink.
No amount of coffee or number of cold
showers will speed that up.
‘‘I’ll be careful” isn’t the
right answer. What
if there’s an emergency, a need to
take sudden action, as when a child darts into the street?
A person with even a moderate BAC might not be able
to react quickly enough to avoid the collision.
There’s something else about drinking and driving that
many people don’t know. Medical research shows that
alcohol in a person’s system can make crash injuries
worse, especially injuries to the brain, spinal cord
or
heart. This means that when anyone who has been
drinking
-- driver or passenger -- is in a crash, that
person’s chance of being killed or permanently disabled
is higher than if the person had not been drinking.
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Control of a Vehicle
You have three systems that make your vehicle go where
you want it to go. They are the brakes, the steering and
the accelerator. All three systems have to do their work
at the places where the tires meet the road.
Braking
Braking action involves perception time and reaction
time.
First, you have to decide to push on the brake pedal.
That’s
perception time. Then you have to bring up your
foot and do it. That’s
reaction time.
Average reaction time is about 3/4 of a second. But
that’s only an average. It might be less with one driver
and as long as two or three seconds or more with
another. Age, physical condition, alertness, coordination, and eyesight all play a part.
So do alcohol, drugs and
frustration. But even in
3/4 of a second, a vehicle
moving at
60 mph (100 km/h) travels 66 feet (20 m).
That could be a lot of distance in an emergency,
so
keeping enough space between your vehicle and others
is important.
And,
of course, actual stopping distances vary greatly
with the surface of the road (whether it’s pavement or
gravel); the condition
of the road (wet, dry, icy); tire
tread; and the condition
of your brakes.
Sometimes, as when you’re driving on snow or ice, it’s
easy to ask more of those control systems than the tires
and road can provide.. That means you can lose control
of your vehicle.
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Avoid needless heavy braking. Some people drive
in spurts
-- heavy acceleration followed by heavy
braking
-- rather than keeping pace with traffic. This
is a mistake. Your brakes may not have time to cool
between hard stops. Your brakes will
wear out much
faster if you do a lot of heavy braking.
If you keep pace
with the traffic and allow realistic following distances,
you will eliminate a lot of unnecessary braking. That
means better braking and longer brake life.
If your engine ever stops while you’re driving, brake
normally but don’t pump your brakes. If you do, the
pedal may get harder to push down. If your engine
stops, you will still have some power brake assist. But
you will use it when you brake. Once the power assist is
used up, it may take longer to stop and the brake pedal
will be harder to push.
Bnti-Lock Brakes (Option)
:f your Pontiac has anti-lock brakes (ABS), it has an
dvanced electronic braking system that will help
Irevent a braking skid.
If your vehicle has anti-lock brakes, the brake pedal will
;ay
so.
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I
260L 0 0 instrument panel will come
And this
light on the
R p M x1 000 on briefly when you start
your vehicle.
When you start your vehicle, or when you begin to drive
away, you may hear a momentary motor or clicking
noise. And you may even notice that your brake pedal moves a little while this is going on.
This is the ABS
system testing itself.
If there’s a problem with the
anti-lock brake system, the anti-lock brake system
warning light will stay on or flash.
See “Anti-Lock Brake System Warning Light” in the
Index. Here’s how anti-lock works. Let’s say the road
is wet.
You’re driving safely. Suddenly an animal jumps out
in
front of you.
You slam on the brakes. Here’s what happens with
ABS.
A computer senses that wheels are slowing down. If one
of the wheels is about
to stop rolling, the computer will
separately work the brakes at each front wheel and at the
rear wheels.
~~
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The anti-lock system can change the brake pressure
faster than any driver could.
The computer is
programmed to make the most of available tire and
road conditions.
You can steer around
the obstacle while braking hard.
As you brake, your computer keeps receiving updates on
wheel speed and controls
braking pressure accordingly.
Remember: Anti-lock doesn’t change the time
you need
to get your foot up to the brake pedal.
If you get too
close to the vehicle in front
of you, you won’t have time
to apply your brakes if that vehicle suddenly slows or stops. Always leave enough room up ahead to stop, even
though you have anti-lock brakes.
To Use Anti-Lock
Don’t pump the brakes. Just hold the brake pedal down and let anti-lock work for you. You may feel the system
working, or you may notice some noise, but this is
normal. When your anti-lock system is adjusting brake
pressure to help avoid a braking skid, the
LOW TRAC
light will come on. See “Anti-Lock Brake System
Active Light” in the Index.
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Braking in Emergencies
At some time, nearly every driver gets into a situation
that requires hard braking.
If you have anti-lock, you can steer and brake at the
same time. However,
if you don’t have anti-lock, your
first reaction
-- to hit the brake pedal hard and hold it
down
-- may be the wrong thing to do. Your wheels can
stop rolling. Once they do, the vehicle can’t respond to
your steering. Momentum will carry it in whatever
direction it was headed when the wheels stopped rolling.
That could be off the road, into the very thing you were
trying to avoid, or into traffic.
If you don’t have anti-lock, use a “squeeze” braking
technique. This will give you maximum braking while
maintaining steering control. You do this by pushing on
the brake pedal with steadily increasing pressure.
In an emergency you will probably want to “squeeze”
the brakes hard without locking the wheels. If you hear
or feel the wheels sliding, ease off the brake pedal. This
will help you retain steering control.
(If you do have
anti-lock, it’s different: see “Anti-Lock Brakes’’ in the
Index.)
In many emergencies, steering can help you more than
even the very best braking.
Steering
Power Steering
If you lose power steering assist because the engine
stops or the system is not functioning, you can steer but
it will take much more effort.
Steering Tips
Driving on Curves
It’s important to take curves at a reasonable speed.
A lot of the “driver lost control” accidents mentioned on
the news happen on curves. Here’s why:
Experienced driver or beginner, each of us is subject to
the same laws of physics when driving on curves. The
traction of the tires against the road surface makes it
possible for the vehicle to change its path when you turn
the front wheels. If there’s no traction, inertia will keep
the vehicle going in the same direction. If you’ve ever
tried to steer a vehicle on
wet ice, you’ll understand this.
The traction you can get in a curve depends on the
condition of your tires and the road surface, the angle
at which the curve is banked, and your speed. While
you’re in a curve, speed is the one factor you can
control.
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