tire tracks. track vs. tread tire track: path left in the soil by the wheels of a vehicle tire...
Post on 22-Dec-2015
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Track vs. Tread
• Tire Track: path left in the soil by the wheels of a vehicle
• Tire Tread: pattern of tread design on tire
Tracks
• Tracks can be used to indicate:– Direction of travel– Change in direction– Tread wear pattern
Direction and Change of Travel
and moved toward point 2
This vehicle began at point 1
The vehicle stopped and backed up to point 3
The vehicle stopped at point 3 and then moved forward to point 4
Tire Tread Patterns
• Records are kept of different tire tread patterns so that tires can be traced to different sizes of tires and often different makes and models of vehicles
Preserving Tracks
• Photograph the track first!! If a cast cannot be made, photographs will be very important
• Make sure to use a scale that will show in the photographs
• Dental stone is used to make a cast• If a track is in snow, a special wax is
used to make the track hard enough to cast
Measuring Tracks• Tracks must be measured• Tire Track Width: distance in inches between
the middle of the two front tires or the two back tires
• Tire track width is used to identify the type of vehicle
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