Revised Info

IMPENDING IMPACT ZONE (IIZ) -  As it has been written in Crash Reconstruction manuals, so called “impending impact zones” are areas of known distances proceeding each vehicle on the highway, depending on its specific velocity/speed.

It’s distance “zone” includes perception, reaction, execution time and braking time/distance at a given speed.  The condition of the road surface can include many variables.  Although the (f) and - + grade are considered in this “zone” calculation.   

For the average, healthy driver motoring his vehicle down the highway, if anything (like another vehicle pulling from a driveway onto the highway or a pedestrian stepping off the curb in a crosswalk) …  if any object is in or enters the “IIZ”, a collision will generally result.   

meant to portray.

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