GMC ENVOY 1998 Owners Manual

Defensive Driving
The best advice anyone can give about driving is:
Drive defensively.
Please start
with a very important safety device in your
vehicle: Buckle up. (See "Safety Belts"
in the Index.) Defensive driving really means
"be ready for anything."
On city streets, rural roads or freeways,
it means
"always expect the unexpected."
Assume that pedestrians or other drivers are going to be
careless and make mistakes. Anticipate what they might
do. Be ready for their mistakes.
Rear-end collisions are about the most preventable of
accidents. Yet they are common. Allow enough
following distance.
It's the best defensive driving
maneuver.
in both city and rural driving. You never
know when the vehicle
in front of you is going to brake
or
turn suddenly.
Defensive driving requires that a driver concentrate
on
the driving task. Anything that distracts from the driving
task
-- such as concentrating on a cellular telephone
call, reading, or reaching for something on the
floor
-- makes proper defensive driving more difficult
and can even cause a collision, with resulting injury.
Ask a passenger to help do things like this, or pull off
the road
in a safe place to do them yourself. These
simple defensive driving techniques could save
your life.
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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 nee.ds
to drive
a vehicle:
0 Judgment
0 Muscular Coordination
Vision
0 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, over
17,000 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 highway 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 The amount of alcohol consumed
0 The drinker’s body weight
The amount of food that is consumed before and
during drinking
0 The length of time it has taken the drinker to
consume the alcohol.
According to the American Medical Association,
a
180-lb. (82 kg) person who drinks three 12-ounce
(355 ml) bottles of beet- 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
mlj 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 ~neans that a
woman generally will reach a higher BAC level than a
miin of her same body weight when each has the same
number
of drinks.
The law
in many US. 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 United States 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
BAC 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
12 times greater; at a
level of 0. IS percent, the chance is 25 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.
1 A CAUTION:
Drinking and then driving is very dangerous.
Your reflexes, perceptions, attentiveness and
judgment can be affected by even a small amount
of alcohol. You can have a serious -- or even
fatal
-- collision if you drive after drinking.
Please don’t drink and drive
or ride with a driver
who has been drinking. Ride home in
a cab; or if
you’re with a group, designate a driver who will
not drink.
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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 314 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
i
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.
!
I
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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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; the condition of your brakes; the weight of the
vehicle and the amount of brake force applied.
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 rnucit 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. Th, ti t 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.
Anti-Lock Brakes (ABS)
Your vehicle has anti-lock brakes (ABS). ABS is an
advanced electronic braking system that will help
prevent
;1 braking skid.
When you start your engine and begin to drive away,
your anti-lock brake system
will check itself. You may
hear
a momentary motor or clicking noise while this test
is going on. This is normal.
If there’s a problem with the
anti-lock brake system, this
warning light
will stay on.
See “Anti-Lock Brake
System Warning Light”
in
the Index.
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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
both rear wheels. 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.
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Re,member: Anti-lock doesn’t change the time you need
to get your foot up to the brake pedal or always decrease
stopping distance.
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.
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.
Using Anti-Lock
Don‘t pump the brakes. Just hold the brake pedal down
firmly and let anti-lock work for you. You may feel the
brakes vibrate,
or YOLI may notice some noise, but
this is normal. Your anti-lock brakes work at all
times
-- whether you are in two-wheel or
four-wheel drive.
Braking in Emergencies
With anti-lock, you can steer and brake at the same
time.
In many emergencies, steering can help you more
than even the very best braking.
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.
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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
YOLK speed. While
you’re
in a curve, speed is the one factor you
can control.
Suppose you’re steering through a sharp curve.
Then you suddenly accelerate. Both control
systems
-- steering and acceleration -- have to do
the.ir work where the tires meet the road. Adding the
sudden acceleration can demand too much of those
places. You can lose control.
What should you do if this ever happens? Ease
up on the
accelerator pedal, steer the vehicle the way you want
it
to go, and slow down.
Speed limit signs near curves warn that you should
adjust your speed. Of course, the posted speeds are
based on good weather and road conditions. Under less
favorable conditions you’ll want to go slower.
If you need to reduce your speed as you approach a
curve, do
it before you enter the curve, while your front
wheels are straight ahead.
Try to adjust your speed
so you can “drive” through the
curve. Maintain a reasonable, steady speed. Wait to
accelerate
until you are out of the curve, and then
accelerate gently into the straightaway.
Steering in Emergencies
There are times when steering can be more effective
than braking. For example, you come over
a hill and
find
a truck stopped in your lane, or a car suddenly pulls
out from nowhere, or a child darts
out from between
parked cars and stops right
in front of you. You can
avoid these problems by braking
-- if you can stop in
time. But sometimes you can’t; there isn’t room. That’s
the time for evasive action
-- steering around
the problem.
Your vehicle can perform very well
in emergencies like
these. First apply your brakes. (See “Braking
in
Emergencies” earlier in this section.) It is better to
remove
as much speed as YOLI can from a possible
collision. Then steer around the problem, to
the left or
right depending on the space available.
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Load Recovery
You may find that your right wheels have dropped off
the edge of a road onto the shoulder while
you're driving.
An emergency like this requires close attention and a
quick decision. If you are holding the steering wheel at
the recommended
9 and 3 o'clock positions, you can
turn it a
full 180 degrees very quickly without removing
either hand.
But you have to act fast, steer quickly, and
just as quickly straighten the wheel once you have
avoided the object.
The fac.t that such emergency situations are always
possible is
a good reason to practice defensive driving at
all times
and wear safety belts properly.
OFF - ROAD RECOVE
edge of paved surface
If the level of the shoulder is only slightly below the
pavement, recovery should be fairly easy. Ease
off the
accelerator and then, if there is nothing in the way, steer so
that your vehicle straddles the edge of the pavement. You
can turn the steering wheel up to one-quarter turn until the right front tire contacts the pavement edge. Then turn your
steering wheel to go straight down the roadway.
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