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, 01 APR 2024: Issue 34(3), #200 is out.

 NAPARS News update, 28 FEB 2024: The first newsletter this year is out, and in the Ref.Lib.

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Upcoming events

    • 31 May 2024
    • 12:00 - 14:00
    • Worldwide via Zoom
    • 1330
    Photos with Tripods, Flash, and Polarizers, 2 hours with Thomas Vadnais

    DATE: Friday, 31 May 2024
    TIME: 12 noon - 2 pm EDT (GMT-4)
    COST: Free for NAPARS member;  $5 for non-members
    LOCATION: Worldwide Via Zoom
    ACTAR: This event has been approved for 2 CEUs by ACTAR. Signing in with i-Attend during the show will be required, so get i-Attend on your phone in advance, per the ACTAR info page here:

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


    Almost every AR investigation and reconstruction requires us to make photographs for documentation, analysis (including photogrammetry), demonstration, and to use as exhibits in reports, depositions, and trials. Three tools—tripods, polarizers, and flash—help ensure you create consistent, accurate, good quality, and useful photographs.

    -1- Tripods:     Features to look for.

                            How tall should they be?

                            Uses:    steady camera

                                        level camera

                                        low light or long exposures

                                        when you need to be in the photo

                                        before and after photos

                                        multiple photos from same position

                                        focus stacking.

                            Choosing a tripod head.

     -2- Polarizers:  Reduce glare and enrich saturation.

                            Only filter whose effects you can’t replicate in Photoshop.

                            Useful for almost all site and vehicle inspections.

                            Especially critical for documenting tire marks.

                            Can bring out details on vehicles you can’t see with the naked eye.

     -3- Flash:         Using ambient, full flash, or fill flash.

                            Add light where it’s needed.

                            Show textures.

                            Reduce excessive contrast.

                            Freeze motion.

                            Multiple flashes bring out details in shadows.

    For more than 40 years, Tom has been providing litigation-oriented consulting engineering services in tire failures and applications, forensic photography, and vehicle accident reconstruction. He runs operating out of the Atlanta area, but he travels nationwide for his clients.

    • 23 Sep 2024
    • 08:00
    • 26 Sep 2024
    • 17:00
    • Savannah GA
    • 0
    Join waitlist

    We are pleased to announce final training of 2024 hosted by NAPARS:

    Heavy Vehicle Event Data Recorder (HVEDR) Use in Traffic Crash Investigation Analyst Training, by Forensic Training Group (

    This four-day training offers further training into the history, development, and function of heavy vehicle digital forensics. The investigator’s expanded interpretation skills will assist in the completion of a situation-based crash reconstruction.  Topics include:  

    • Best practices used to access and document HVEDR data,
    • HVEDR Data Available on Heavy Trucks,
    • Use of OEM software/adapters,
    • Use of the Synercon Forensic Link Adapter and TruckCRYPT software,
    • Validation Testing  
    • Case Analysis
    • Outside testing on Tuesday or Wednesday, half day, be prepared for dirty work!

    Eligible for ACTAR credits

    Location: Training facility for Savannah Police Department, 3401 Edwin Street, Savannah GA

    September 23-26 ( Monday thru Thursday), 8-5 every day.

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

    Attendees will be on their own for lunch.

    • 22 Apr 2025
    • 24 Apr 2025
    • Newport Beach, CA
    NAPARS and CA²RS are teaming up to host the

    2025 Symposium on EDR Research and Testing

    We'll be at the Hyatt Regency in Newport Beach, CA

    Mark your calendar.

    More details on speakers as they come available.

    We'll open up registration in a few months.

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

    The New York State Traffic Accident Reconstruction Specialists will be hosting the 2025 Joint Conference in the Lake George NY area.

    Venue: Fort William Henry Resort

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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