Speed from Skidmarks
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Skidmarks left on the pavement at a collision scene tell the investigator many things about the events involved in a motor vehicle collision. One common example involves using the length of the mark to calculate pre-collision speed.

Question: What kind of qualifications do police officers have for doing mechanical inspections on vehicles? I have a 2010 GMC Sierra that I keep in excellent shape in all respects but I got a defective vehicle ticket and a safety inspection order after being stopped.
In my travels this week I was overtaken by a marked police vehicle travelling at 110 km/h in the posted 90 km/h zone. No emergency equipment was being operated. Instances like this are often complained about by the public as they see the police failing to follow the same traffic rules that they force everyone else to obey.
