forensic tire impression and tire track evidence
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Forensic Tire Impression and Tire Track Evidence. Tire Impressions reflect the tread design and dimensional features of individual tires on a vehicle Tire Tracks are relational dimensions between two or more tires: tracks can be used to determine the wheelbase of the vehicle.

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forensic tire impression and tire track evidence
Forensic Tire Impression and Tire Track Evidence
  • Tire Impressions reflect the tread design and dimensional features of individual tires on a vehicle
  • Tire Tracks are relational dimensions between two or more tires: tracks can be used to determine the wheelbase of the vehicle
tread nomenclature and sidewall information1
Tread Nomenclature and Sidewall Information
  • Department of Transportation number, known as DOT number – consists of:
tread nomenclature and sidewall information2
Tread Nomenclature and Sidewall Information
  • Retread tires – have slightly different numbers
  • DOTR YPY 1201
  • DOTR – Department of Transportation retread
  • YPY – Manufacturer retread
  • 1201 – date and year of manufacture
tire track evidence
Tire Track Evidence
  • Tire track evidence consists of:
    • Tire track width
    • Wheelbase dimensions
    • Turning diameter
    • Relative positions of turning tracks
recovery
RECOVERY
  • Tire impressions must be:
    • Photographed from all angles with and without measurement tool (ruler)
    • Cast – a 3 foot impression requires 15-25 pounds of dental stone
    • Measured – width, length and depth
    • Direction of travel noted
    • Impressions made if possible, and
    • Pictures of the source (tire) must be included for comparison
comparisons
COMPARISONS
  • Tire tread examinations compare the tire impressions recovered from scene with tires taken from a known vehicle
  • Two categories of tires:
    • Suspect - Vehicle of suspect
    • Elimination - Vehicles of police, ambulance, etc
  • All tires should be seized from suspect vehicle for comparison
comparisons1
COMPARISONS
  • Forensic examination begins with visual comparison and elimination of tires which do not match impression
  • Forensic examination continues with full circumference test impressions
  • Impressions are superimposed on known impression over cast or original tire
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