CHP Accident Investigation 2

Question 1

What is the primary purpose of measuring skid marks at a collision scene?

Accepted Answer

To estimate the vehicle's pre-braking speed

Answer

Skid mark length is used with the drag factor in the speed formula to estimate how fast the vehicle was traveling before braking began.

Question 2

Which physical evidence is most critical for determining the point of impact (POI) in a collision?

Accepted Answer

Debris field, fluid deposits, and gouge marks on the roadway

Answer

Debris, fluids, and gouge marks typically fall at or near the point of impact and are the primary indicators used to locate the POI.

Question 3

In California, what form does the CHP use to document a traffic collision?

Accepted Answer

CHP 555

Answer

The CHP 555 (Traffic Collision Report) is the standard form used to document all traffic collisions investigated by the California Highway Patrol.

Question 4

How do yaw marks differ from skid marks at a collision scene?

Accepted Answer

Yaw marks are curved marks from a rotating vehicle while skid marks are typically straight from locked wheels

Answer

Yaw marks have a curved pattern caused by a vehicle sliding sideways, while skid marks are typically straight parallel lines from locked braking wheels.

Question 5

When photographing a traffic collision scene, what should be documented FIRST?

Accepted Answer

Wide-angle overview shots establishing the overall scene

Answer

Overview photographs should be taken first to establish the general scene before any evidence is moved, then progress to mid-range and close-up photos.

(CHP) California Highway Patrol Practice Test

(CHP) California Highway Patrol Practice Test

CHP Accident Investigation 2