One thing I learned in Traffic Homicide Investigation school is that tread wear has no effect on skidding or stopping. The speed of a vehicle at the time of the crash is obtained by the skids, type of skids (straight line vs. yaw, etc) and surface. A tool that is made from a tire cut in half and then filled with a prescribed amount of concrete (weight) is then pulled across the surface with a device very much like a bow draw weight measuring tool. The weight it takes to pull it across the surface is then put into a formula that will give you the speed of the vehicle at the time the skid marks were made. The treads on the vehicle have nothing to do with the formula.
In other words, treads help stop hydroplaning and that is about it, unless you have mud grips and are in some good Dallas County Blackbelt Prairie Mud, then they help, for a second or two, but then your still screwed.
Last edited by jawbone; 09/30/19 02:09 PM.
