What is the mark called that indicates the speed of a truck that slides in a curve?

The term that indicates the speed of a truck that slides in a curve is called a yawmark. This type of mark is left on the roadway when a vehicle experiences oversteer during a turn, causing it to slide sideways. The yawmark is an important piece of evidence in accident reconstruction, as it can indicate the vehicle's trajectory, the direction of travel, and the speed at the moment of the slide.

Different types of marks, such as skid marks or drift traces, represent other vehicle dynamics. Skid marks are associated with braking when tires are locked, and drift traces don't specifically refer to a sideways slide but rather a controlled maneuver through a curve. Understanding these different terms enhances a driver's and a responding officer's ability to analyze road conditions and vehicle handling in various situations.