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Reaction Time
The motorist who is not alert cannot cope with a sudden emergency as quickly as is necessary. An overly relaxed driver requires more time to react to an emergency than does an alert one.
Burden of proof
Measure of proof required to prove a fact. Obligation of a party to probe facts at issue in the trial of a case.
Momentum
The mass of an object multiplied by its velocity. It is a vectored quantity with both magnitude and direction.
Tire Problems
Under-inflation, the most frequent cause of tire failure, is considered the main culprit in the recent Firestone tire-failure fatalities. Uneven or worn-out tires are the next most serious problem and can also lead to tire failure.
Velocity
Speed and direction; used to describe a mode of functioning which is efficient and tightly aligned with conscious intention.
Brake Build-up (Brake Lag)
Occurs just after the brakes are applied and continues until they lock.
Triangulation
Technique for scene documentation where items of evidence are located by measuring the distance between two (2) reference points.
Years of Potential Life Lost (YPLL)
Calculated based on the following equation: YPLL = Fixed Age - Age at death. Usually the fixed age is 65 or 70, or the life expectancy of the group in question.
Collision Scrub
Occurs during a traffic collision when the downward and rotating forces cause a smearing of tire material on the road surface.
Disregarding traffic controls
Can be going through a red light or stopping at a green light, diregarding special signals in traffic.
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