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Common law
Law which derives its authority solely from usage and customs of immemorial antiquity or from the judgments and decrees of courts. also called "case law."
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.
Blood alcohol testing
At all levels of blood alcohol concentration, the risk of being involved in a crash is greater for young people than it is for older people (Mayhew 1986). In 2001, 25% of drivers ages 15 to 20 who died in motor vehicle crashes had been drinking alcohol (NHTSA 2002b).
Reference Point
In angular momentum, the point in space around which the motion of an object is described. The angular momentum of an object is defined in relation to some point, the reference point. The velocity and radius of an object are measured from the reference point.
Tailgating
Folowing too close to another car, not alowing space for you to brake or car in front to brake. The operation of a motor vehicle in a manner that endangers or is likely to endanger persons or property
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.
Failure to signal
There are laws and driving rules that instruct proper turning signals, at time a hand or a light signal is required to be used. A right hand turn may not be permited, or a turn in an intersection may be done incorectly.
Momentum
The mass of an object multiplied by its velocity. It is a vectored quantity with both magnitude and direction.
Collision Scrub
Occurs during a traffic collision when the downward and rotating forces cause a smearing of tire material on the road surface.
Failure to yield the right of way
Can be when you proceed forward while disregarding right of way signs or signals for other cars. You may not be the car that is sopossed to go forward.
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