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