Control Of A Vehicle; Braking - Chevrolet Impala 2007 Owner's Manual

Control of a Vehicle

The following three systems help to control your
vehicle while driving — brakes, steering, and
accelerator. At times, as when driving on snow
or ice, it is easy to ask more of those control
systems than the tires and road can provide.
Meaning, you can lose control of your vehicle.
See Traction Control System (TCS) on page 256.
Adding non-dealer/non-retailer accessories can
affect your vehicle's performance. See Accessories
and Modifications on page 296.

Braking

See Brake System Warning Light on page 181.
Braking action involves perception time and
reaction time.
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First, you have to decide to push on the brake
pedal. That is perception time. Then you have to
bring up your foot and do it. That is reaction time.
Average reaction time is about three-fourths of a
second. But that is 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
three-fourths 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 is
pavement or gravel; the condition of the road,
whether it is wet, dry, or icy; tire tread; the condition
of the brakes; the weight of the vehicle; and the
amount of brake force applied.