TAR I

Question 1

Three circumstances that will cause a tire friction mark:

Answer 1

Extreme deceleration
Extreme acceleration
Extreme change in direction

Question 2

Tire abrasion with smear is described as:

Answer 2

Smear of tar/asphalt along with abrasion of tire material

Question 3

The primary marking mechanism on a PCC surface is __________

Answer 3

Tire abrasion

Question 4

Erasing caused by a locked wheel tire is _________

Answer 4

Short lived

Question 5

4 common types of tire friction marks are:

Answer 5

Side skid
Locked wheel
Impending skid
Critical speed scuff (yaw marks)

Question 6

Indicators of a critical speed scuff (CSS)

Answer 6

Starting thin and widening
Arced
Striations in a direction at an angle to the direction the vehicle is traveling
Outboard rear tire tracks outside of outboard front tire
Typically, outboard front tire leaves darkest mark

Question 7

A CSS transitions to a side skid when heading direction of the vehicle exceeds _________degrees from center mass path of travel of a vehicle

Answer 7

20

Question 8

The best method for measuring the distance of a straight lines locked wheel tire friction marks used for calculating velocity is ___________

Answer 8

Longest skid mark

Question 9

If a vehicle is rotating during deceleration, the best method for determining determining the distance the vehicle traveled is _______________

Answer 9

Center mass path of travel