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Collision Scrub
Occurs during a traffic collision when the downward and rotating forces cause a smearing of tire material on the road surface.
Impending Skidmarks
Also known as shadow skidmarks are small fragments of rubber, ground or scraped from the tire, at the tire and roadway interface, as the rotating tire slows to a locked position.
Excessive speed & Speeding
Speeding is defined as travelling faster than the posted speed limit, or travelling too fast for the road conditions even at speeds under the posted limit.
Breakover Angle
when a vehicle crests a hill, it's the angle at which the front tires still remain on the ground as the rear wheels continue to climb (see High Centered)
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.
Subpoena
Document issued by the authority of the court to compel a witness to appear and give testimony or produce documentary evidence in a proceeding. Failure to appear or produce is punishable by contempt of court.
Interrogatories
Written questions developed by one party's attorney for the opposing party.
Triangulation
Technique for scene documentation where items of evidence are located by measuring the distance between two (2) reference points.
Brake failure
Brake failure can happen. Drum brakes are more commen to fail. Modern dual-circuit brake systems have made total brake failure an unlikely event. If one side of the circuit fails, the other side is usually sufficient to stop a vehicle.
Tripped Rollovers
NHTSA data show that 95% of single-vehicle rollovers are tripped . This happens when a vehicle leaves the roadway and slides sideways, digging its tires into soft soil or striking an object such as a curb or guardrail.
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