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Commercial Vehicle Crash Investigation - Level II  


Designed to further enhance the knowledge and skills you acquired in IPTM’s Commercial Vehicle Crash Investigation–Level I course, this class focuses on a detailed analysis of commercial vehicle systems and dynamics along with the application of your findings to the crash reconstruction.

We will begin by analyzing the ABS air brake system on commercial motor vehicle (CMV) truck-tractors and trailers by conducting tests to determine average air brake chamber pressure. You will participate in a “hands-on” field inspection as we conduct brake tests with a CMV.

We’ll teach you how to construct free-body diagrams and formulate equilibrium equations to determine the range of weight distribution on the axles. We will also examine quasi-static and dynamic rollover propensities and conduct an analysis of suspension spring rates.

After a review of high and low speed off-tracking, we will show you how to derive the equations for establishing maximum off-track distance. You will also learn how to interpret and analyze rotational motion that may be present in a CMV crash.

Finally, we will discuss the different types of transmissions used in today’s commercial motor vehicles and teach you how to obtain the range of speeds for the vehicle based upon the gear position at the time of the crash.

Topics Include

  • Tractor-trailer ABS air brake system
  • Hydraulic brake systems in commercial vehicles and how fluid pressures are boosted
  • Quasi-static and dynamic rollover propensities and liquid loads
  • Axle weight analysis and load reconstruction
  • Off-tracking
  • Speed from gear ratio
  • Rotational mechanics
  • Field inspection


Law enforcement and private traffic crash investigators, claims adjusters, engineers, attorneys, safety officers, military investigative personnel, animators and graphic designers

Course Length

40 hours


You must have completed, at a minimum, IPTM’s Advanced Traffic Crash Investigation and Commercial Vehicle Crash Investigation – Level I courses.

Other Courses in the Series

ACTAR Information

IPTM's Commercial Vehicle Crash Investigation - Level II course is eligible for 40 ACTAR CEUs.

What Our Students Are Saying

  • “Greatly increased my knowledge to deal with commercial vehicle crashes and the data involved.” – Dep. T.S.
  • “Practical outdoor exercises were invaluable to aid in understanding theories learned in class setting. Fantastic course with great, very knowledgeable instructors!” – Dep. L.T.
  • “Very well put together course. Instructors are very knowledgeable in this field and are able to clearly present this material to the level of class participants.” – Ofc. W.D.
  • “Great course. Definitely increased my knowledge and awareness of the data collected and its importance.” – M/Ofc. R.L.


Commercial Vehicle Crash Investigation - Level II
    7/29/2019 - 8/2/2019 Lawrence Indiana    
Class times:  8:00 AM to 5:00 PM Fee: $825.00
Location Information:  IVY Tech University
Room TBD,  9530 East 59th Street Lawrence, IN 46216

Commercial Vehicle Crash Investigation - Level II
    10/7/2019 - 10/11/2019 Jacksonville  Florida    
Class times:  8:00 AM to 5:00 PM Fee: $825.00
Hotel and Location Information:  IPTM - University of North Florida
Adam W. Herbert University Center, 12000 Alumni Drive, Jacksonville, FL  32224

Commercial Vehicle Crash Investigation - Level II
    11/4/2019 - 11/8/2019 Meriden Connecticut    
Class times:  8:00 AM to 5:00 PM Fee: $825.00
Location Information:  Connecticut State Police Training Academy
Room TBD,  285 Preston Avenue Meriden, CT 06450
Instructor(s): Walter Dobson