National Association of Professional Accident Reconstruction Specialists

Members get access to the Reference Library of technical papers and crash related reference materials, and a NAPARS exclusive: all back-issues of Accident Reconstruction Journal and Accident Investigation Quarterly, and more! Click Join for more details!   

         

 Accident Reconstruction Journal update, 30 Nov 2024: Issue 34(6), #204 is out.

 NAPARS News update, 29 Sep 2024: The third newsletter this year is out, and in the Ref.Lib.

Join us on Facebook for a daily Recon Tidbit: https://www.facebook.com/NAPARSadmin/

Upcoming events

    • 06 Jan 2025
    • 08:00
    • 10 Jan 2025
    • 16:00
    • Aurora Ontario Canada
    • 23
    Register

    CDR Analysis and Application

    Instructor: Brad Muir / Crash Data Specialists

    Location:  York Regional Police Headquarters

    47 Don Hillock Dr.

    Aurora, ON L4G 0S7

    Fee: $630 per person (25 attendees)

    (You must be a current member of NAPARS to receive this discounted rate)


    • 10 Jan 2025
    • 12:00 - 14:00
    • Worldwide via Zoom
    • 1365
    Register
    TBI in Low Severity Crashes 2 hours with Stephen Wagner DC
    DATE: Friday, 10 January 2025
    TIME: 12 noon - 2 pm EDT (GMT-5)
    COST: Free for NAPARS members;  $5 for non-members
    ACTAR: This event has been approved for 2 CEUS by ACTAR. Accredited attendees will need to sign in with the i-Attend during the presentation.

    All attendees will be able to request an attendance certificate during the show.

    SUMMARY:

    We will have Stephen Wagner from Portland Oregon to discuss the potential for injury during low-severity crashes and a possible fix for the problem for some patients.

    OUTLINE:

    • Head accelerometer data from human crash testing in 3-5mph delta-V crashes
    • Probability of these causing brain injury
    • 5-8 cases of real world minimal visible damage crashes
    • Several of them have EDR data (or lack of)
    • All of these cases were diagnosed as having concussions with persistent symptoms (post-concussion syndrome) or mild traumatic brain injuries
    • Biomechanics of the spine and factors that are often overlooked.
    • Why it is unlikely that they suffered an actual brain injury
    • What may be a better explanation of the cause of their symptom.

    NOTE: This presentation will be recorded, and placed in the Reference Library.

    • 03 Feb 2025
    • 08:00
    • 07 Feb 2025
    • 16:00
    • Renton, Washington (South of Seattle)
    • 10
    Register

    CDR Analysis and Application

    Instructor: Brad Muir / Crash Data Specialists

    Location:  900 Oakesdale Avenue SW

    Renton, WA. 98057

    Fee: $760 per person (25 attendees)

    (You must be a current member of NAPARS to receive this discounted rate)


    • 07 Feb 2025
    • 12:00 - 14:00
    • Worldwide via Zoom
    • 1388
    Register
    Digital Integration and Building Charts in Excel from a CSV File, 2 hours with W.Bartlett
    DATE: Friday, 07 February 2025
    TIME: 12 noon - 2 pm EDT (GMT-4)
    COST: Free for NAPARS members;  $5 for non-members
    ACTAR: This event has been approved by ACTAR for 2 CEUs consideration. Accredited attendees should be prepared to sign in with i-Attend app during the presentation.

    All attendees will be able to request an attendance certificate during the show.

    SUMMARY:

    I will be working with a CSV file recorded during an acceleration/braking event using the G-Field Recorder phone-app. We will digitally integrate the accelerometer data to get speed. If time permits, I'll compare these results with a VBox Sport running at the same time during the test. Topics will include:

    -File structure & saving your work - don't lose original file!

    -digital integration of acceleration - multiply time step duration by ft/s/s to get ft/s speed change in each step, then sum them all all to get total speed change.

    -Setting up columns for simple chart generation, or selecting non-contiguous columns

    -Adjust bias out of signal acceleration data, shifting timebase to line GPS and calculated speed values

    -Borders, gridlines, axis labels, titles, fonts, colors

    -Dual axis charts - managing color & scales

    -Legend, if you must

    -Sharing your chart - printing or inserting into a report

    One possible result from the file we'll be using looks like this:


    • 07 Mar 2025
    • 12:00 - 14:00
    • Worldwide via Zoom
    • 1469
    Register

    Finding A/B stiffness values from NHTSA data - 2 hour Zoom with Dan Vomhof 3rd

    DATE: Friday, 7 March 2025
    TIME: 12 noon - 2 pm EDT (GMT-4)
    COST: Free for NAPARS members;  $5 for non-members
    ACTAR: This event will be submitted for CEU consideration by ACTAR.

    All attendees will be able to request an attendance certificate during the show.

    SUMMARY:

    We will have Dan Vomhof III (Known to many as DV3) with us to show us how to find A & B stiffness coefficients from NHTSA crash test data. 

    • 22 Apr 2025
    • 08:00
    • 24 Apr 2025
    • 17:00
    • Hyatt Regency Newport Beach, California
    Register

    NAPARS and CA²RS are teaming up to host the

    2025 Symposium on EDR Research and Testing

    April 22nd - 24th, 2025

    Location:  Hyatt Regency

    1107 Jamboree Road

    Newport Beach, California 92660

    949.729.1234


    NAPARS is proud to announce that we are continuing in our efforts to bring training around the country and globe, by bringing the 2025 Symposium on EDR Research and Training to California for 2025. For 2025, NAPARS has partnered with CA²RS to bring a great lineup of speakers from various fields to enhance the training for everyone in EDR's.

    The list of Speakers for 2025 will include:

    Brad Muir of Crash Data Specialists

    Alan Moore of A.B. Moore Forensic Engineering, Inc.

    Greg Russell of JS Held

    Eric Deyerl of DIAL Engineering

    Billy Cox of The Billy Cox Group

    Robert "Bob" Anderson of Biomechanics Analysis

    Nick Manz Product Engineer with Toyota

    Vlad Bortchevsky of JS Held

    James Loftis with The Forensic Training Group

    Steve Anderson with the Forensic Training Group

    Lou Peck with Axiom Forensics and LightPoint Data

    Ed Fatzinger of Momentum Engineering

    Matt DiSogra of Delta-V


    In keeping with the NAPARS philosophy of providing the best training, at the best prices, and with the best trainers, you will receive three days of training on EDR Research and Training and be provided breakfast and lunch at the low price of $599.00 per person.  


    Our lodging partner is the beautiful Hyatt Regency of Newport Beach, California. Room rates have been secured at $189.00 per night plus, applicable taxes. This discounted rate is available from Monday April 21st through Friday April 25th for attendees. To register directly with the Hyatt Regency, please click the link,

    https://www.hyatt.com/en-US/group-booking/NEWPO/G-RS53

    Below is a list of amenities provided by the Hyatt Regency:

    • Premium Wireless Guest Room Internet for up to 6 devices.
    • Green Fees/Club Rentals at Back Bay Golf Course
    • Beach Cruisers (up to 2 hours complimentary)
    • Variety of Games including Shuffleboard, Ping Pong, Volleyball etc.
    • Water Slide and Splash Pad
    • Fitness Center with 2 Pelotons, 24 Hour Access
    • 3 Pools and 3 Hot Tubs
    • 2 Bottled Water in guest room daily
    • In Season-Recreation led activities at the Oasis Pool
    • Beach Kits Available (includes 2 chairs and an umbrella)
    • Business Center/Computer Access, Local and 800 Calls
    • 24-hour text messaging services
    • Electric Car Charging
    • Fire Pit Experiences

    *Hotel policies and procedures subject to change



    • 28 Apr 2025
    • 08:00
    • 01 May 2025
    • 17:00
    • Glendale Police Station 6835 N 57 Drive Glendale, AZ 85301
    • 22
    Register


    MOTORCYCLE COLLISION RECONSTRUCTION

    INSTRUCTOR:  LOU PECK

    The Motorcycle Collision Reconstruction course equips the analyst with a firm understanding of motorcycle dynamics and current reconstruction techniques through deep review of literature, sample evidence, and exercises. The following topics are covered:

    1. Introduction to motorcycle crash causation, motorcycle anatomy, and specification research

    2. Review of kinematics including units, conversions, and derivations of basic equations

    3. Fundamentals of motorcycle dynamics (geometry, stability, steering, weight transfer, suspension, etc.)

    4. Motorcycle inspection

    5. Rider perception-response time

    6. Braking systems and rider performance

    7. Introduction to Excel for collision reconstruction

    8. Dynamics of swerving and rider performance

    9. Acceleration behavior, calculations, and gearing analysis

    10. Sliding friction for downed motorcycles

    11. Analysis of wheelbase reduction for determination of impact speed

    12. Angular momentum

    13. Rider and pillion vault analysis

    14. Event data recorders and dataloggers

    15. Simulation analyses for impact speed determination

    16. Monte Carlo analysis to determine confidence in speed ranges


    • 05 May 2025
    • 08:00
    • 07 May 2025
    • 17:00
    • Cranberry Township Public Safety Training Center 1000 Maintenance Drive Cranberry Township, PA 16066
    • 19
    Register

    We are pleased to announce Heavy Vehicle EDR training of 2025 hosted by NAPARS:

    Heavy Vehicle Event Data Recorder (HVEDR) Use in Traffic Crash Investigation Analyst Training, by Forensic Training Group (https://forensictraininggroup.com/)

    This 2.5-day starts with a refresher of definitions, supported vehicles and recent updates to OEMs. Progression into damaged vehicles, supplying power to a partial system, off-vehicle imaging considerations and predictive mentality are discussed. The bread and butter of the course talks about digital data from Advanced Driver-Assistance Systems from Wabco OnLane/OnGuard, Bendix Wingman Fusion, and Detroit Assurance. Other data sources such as dash cameras, electronic logs and fleet tracking systems are also included. The final pieces of this training opportunity included digital data from trailers and transmissions and how they may be of relevance to semi-truck collision investigations. This class offers a half day of practical testing with collision mitigation system(s).

    Eligible for ACTAR credits

    Location: Cranberry Township Public Safety Training Center 

                      1000 Maintenance Drive

                      Cranberry Township, PA  16066

    May 5 - 7, 2025 ( Monday thru Wednesday), 8-5 every day.

    Cost: $500 for NAPARS members, $750 non-members

    Attendees will be on their own for lunch.

    • 10 Jun 2025
    • 08:00
    • 12 Jun 2025
    • 17:00
    • Iowa State Police 260 N.W. 48th Place Des Moines, IA 50313
    • 25
    Register

    MICROSOFT EXCEL for TRAFFIC CRASH RECONSTRUCTION

    Instructor:  Andy Rich

    Iowa State Police
    260 N.W. 48th Place
    Des Moines, IA 50313

    This course will teach the reconstructionist how to use Microsoft Excel to solve just about every reconstruction problem that may be encountered. NO prior experience with Excel is necessary. This course begins at Step 1! Some of the topics covered:

    • Writing formulas in Excel
    • Spin Analysis
    • Conservation of Linear Momentum ("360 Momentum").
    • Airborne
    • Critical speed yaw
    • Sensitivity analysis
    • Performing Monte Carlo simulation with Excel
    • Performing finite difference analysis with Excel
    • Using Excel for EDR analysis
    • Closing speed analysis
    • Obtaining delta-V from acceleration data
    • Graphing for the jury
    • Programming your own user-defined reconstruction functions and add-ins
    • Solving simultaneous energy/restitution and momentum equations using Solver
    • Cell formatting
    • Conditional formula execution
    • Option buttons
    • List boxes
    • Using names to refer to cells and ranges

    Requirements: All students must have completed reconstruction or technical and must have access to a laptop running Microsoft Excel version 2010 or greater.

    This course has been approved for 24 ACTAR CEUs


    • 04 Aug 2025
    • 08:00
    • 08 Aug 2025
    • 19:00
    • Oklahoma City Police Department Building #3 3738 SW 15th St. Oklahoma City, Ok. 73108
    • 23
    Register

    BASIC HUMAN FACTORS IN CRASH RECONSTRUCTION

    Instructors: Driver Research Institute

    August 4, 2025 - August 8, 2025

    Location: Oklahoma City Police Department Training Facility Building #3

    3738 SW 15th St

    Oklahoma City, Oklahoma 73108


    • 22 Oct 2025
    • 24 Oct 2025
    • Lake George, NY

    The New York State Traffic Accident Reconstruction Specialists will be hosting the 2025 Joint Conference

    https://nystars.org/joint-conferences

    Venue: Fort William Henry Resort, Lake George NY

    NYSTARS, NAPARS, NJAARS, MdATAI, and NATARI rotate responsibility for the Annual Joint Conference each year.


NAPARS membership includes a complimentary subscription to the digital edition of the Accident Reconstruction Journal, which comes out 6 times each year. ARJ provides timely, reliable, and fresh research, thought-provoking reconstruction related studies and meaningful crash test data from multiple sources.
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