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
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.
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
(1
00
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.
4-5
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