tire impressions. tire impression evidence what is tire impression evidence? how is it involved in...
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Tire Impressions
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Tire Impression Evidence
What is tire impression evidence? How is it involved in crime scenes? How is it collected? How is it analyzed?
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What are tire impressions or tracks?
Tire Impressions are the tread design and dimensions of a tire.
Tire Tracks are the related dimensions of the 4+ wheels.
Tire Impressions
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Different Types of Tires:
Original Equipment (OE) Tires sold on new cars thousands of cars have same brand and size
Replacement Tires: purchased to replace old, worn tires usually different than OE tires
Tire Impressions
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Design Elements:
Grooves: around a tire
Sipe: small grooves
Slots: across a tire
Tread Wear Indicator: raised bar under design; shows after wear
Tire Impressions
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Noise Treatment:
If tire design was exactly repeated around the tire, noise would result.
Design repeated at different pitch lengths
Tire Impressions
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Tire Track Evidence:
Track width: measured from right center to left center
Track width of front tires and rear tires are not always the same.
Tire Impressions
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Tire Track Evidence:
Wheelbase: measured from front center to back center
Tire Impressions
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Tire Track Evidence:
Turning Diameter: Diameter of a circle made when the wheels are fully turned.
Tire Impressions
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Recovery of Tire Evidence:
Photos taken along with log of location.
Since tire tracks are variable along length (pitch), entire track should be photographed (examination quality) with overlapping photos.
Ruler included
Tire Impressions
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Recovery of Tire Evidence: Cast can be made of 3-D impressions Long sections (3 feet) should be cast. Use dental stone
Tire Impressions
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Analysis of Tire Evidence:
Class Characteristics can be used to eliminate a suspected tire or suggest a tire could have made the track.
Size Tread design
Tire Impressions
Some wear marks
Class Characteristics:
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Analysis of Tire Evidence:
Class Characteristics can be used to eliminate a suspected tire or suggest a tire could have made the track.
Known tires collected. Inked or 3D impressions can be made for comparison.
Tire Impressions
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Analysis of Tire Evidence:
Similar to shoes, individual characteristics can be used to identify an exact tire.
Remember, individual characteristics change over time.
Tire Impressions