1. Chapter 15

2.  Symmetrical  Ridges & grooves channel water away and help tires grip road  Ribs run around entire tire Figure 15-10 on p. 438 removed for copyright.

3.  Tread pattern  Tire size  Track width – distance between the center of each tire  Wheelbase – distance between front axle and rear axle  Turning diameter  Nature of marks – how car was driven Figure 15-11 on p. 438 and Figure 15-12 on p. 439 removed for copyright.

4. Direction of travel can be determined by:  Vegetation disturbed  Debris cast off  Splash patterns  Substance transfer like oil leakage  Tire marks

5.  Using tire marks to determine:  What happened?  Where?  When?  Why?  How fast the cars were moving  Who was involved?  Who was at fault?