determining speed
posted by karl .
car leaves a 20 ft. skid mark how fast was the car traviling

For skid mark analysis, try some of the following sites:
http://search.yahoo.com/search?fr=mcafee&p=how+to+determine+speed+from+a+skid+mark
Sra 
How fast was a car traveling that left a skid mark that was 100 feet long?
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