What are the two types of skid marks?

The correct answer is based on the understanding of vehicle dynamics during an incident. Yaw marks occur when a vehicle slides sideways while turning, indicating that the rear of the vehicle has lost traction. This type of mark provides critical information about the vehicle's direction and speed before the loss of control. Skid marks, on the other hand, are left when a vehicle brakes hard, preventing its wheels from rotating. These marks can indicate sudden braking and can also help to determine the speed of the vehicle just before the skid.

Identifying both yaw marks and skid marks is essential for accident reconstruction and understanding the behavior of a vehicle during a collision or a loss of control. Each type of mark tells a different part of the story regarding how the incident occurred.