Cadillac 1993 Fleetwood Owners Literature page 185

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.
B W N G
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.
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