Determining Vehicle Speed from Yaw Marks
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When a vehicle is in yaw it is rotating around a vertical axis through it's center of mass. The long, curved Y shaped marks left by the tires on the pavement were characteristic of this motion. If they were striated and of constantly diminishing radius they were of great interest for collision reconstruction because the vehicle's speed could be determined from them.

Question: I am wondering if you could shed some light on police issuing an inspection order to vehicles. I own a 1990 Nissan 240SX that usually gets 1-3 vehicle inspection orders a year. The orders are usually box 1's but I get the occasional box 2.
Do Commercial Vehicle Safety and Enforcement (CVSE) officers have the authority to pull over and ticket non-commercial vehicles for traffic violations such as speeding or running a stop sign?