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Collision Magazine is published twice a year. Annual recurring Collision Magazine subscriptions are available and discounts may apply. Collision Magazine is distributed digitally and in hard copy. Back issues are also available in digital format.
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In the next issue of Collision Magazine…

Volume 17 Issue 1

Volume 17, Issue 1 is heading to the printer and should be mailed out shortly to print subscribers and posted online for digital subscribers!

What Is Tesla Sentry Mode And How Does It Work?

Tesla has two separate but related video programs: Tesla dashcam, and Tesla Sentry mode. These systems use the various cameras found on the various Tesla models. This article explores Sentry Mode: what it is and how it works.  Tesla Sentry mode videos have been used in a number of applications from auto theft to vandalism to even capturing things going on near a parked Tesla not unlike a security camera on the side of a building. This article explores the basic function of Sentry Mode which may lead to opportunities for a broader application.

“Invalid” TRG Counts in Toyota EDR data

The “Trigger Count” is seen in Toyota data translation reports identified by the acronym TRG as found in the element identifier “TRG Count” or in the normal numbering convention TRGn (i.e.: TRG2 or TRG65). In some data translation reports, end users have found that the numbering convention seemingly fails and the TRG number is marked “Invalid” in one way or another.  This paper will explore when and why that occurs and offer options for confirming the represented order of events in those affected Toyota data translation reports and explain the meaning of the “invalid” indicator.


Always interesting and informative, crash·ol·o·gy is a recurring component of Collision magazine. In the upcoming issue, crash·ol·o·gy explores Berla infotainment data together with EDR data in two case studies.

Moving Masses and Barrier Impact Dynamics

As automobile impacts go a vehicle running into a flat, fixed, and rigid barrier is about as straightforward as it gets. The vehicle approaches the barrier at some speed; makes contact with the barrier; deforms; bounces off at a diminished speed; and comes to a stop shortly thereafter. Within this seemingly simple impact scenario, however, are some fairly interesting nuances. Here we will explore these nuances little further, starting with an examination of the variable mass concept.

Using Centrodes to Describe Vehicle Motion

In the study of rigid body kinematics, angular velocity is considered a property of the body and is not dependent on the choice of reference point selection. Meaning, for instance, angular rate sensors can be placed anywhere on a rigid body that undergoes rotational motion and the sensors will measure the angular velocity of that body. Examples for vehicle motion in the yaw, pitch and roll planes are presented, providing analysts with an uncommon but, hopefully, interesting perspective of rigid-body motion.

CATAIR 2022 Crash Conference

A review of the 2022 CATAIR Crash Conference which featured pre-conference front– and rear-to-barrier crash tests using a BMW X-5 SUV as well as a barrier crash, a ramp induced rollover and a multi car cras. This article discusses some of the data and observations from the conference.

How does “PII” affect EDR data?

As the legal system in the USA is built of diverse regulations and different federal and state laws, the definition of PII is not as consistent or a structured as the personal data established in the GDPR for the countries in the European Union. A required event data recorder is one of the new automotive safety features included by the new EU General Safety Regulation (EDR). Data
protection issues are raised by the introduction of the EDR as discussed in this article.

Performance of BMW EDR in Instrumented Barrier and Vehicle-to-Vehicle Crashes

A 2016 BMW X5 sport utility vehicle was subjected to a series of seven low speed front and rear-to-barrier tests, followed by a high-speed vehicle-to-vehicle crash demonstration. Among the other parameters covered in this article, EDR-reported pre-crash speed, longitudinal and lateral vehicle acceleration, and longitudinal and lateral delta-V are compared to reference

What else?

Articles for the next issue or in the works for this and upcoming issues of Collision Magazine


How do I subscribe to Collision Magazine?

Subscriptions to Collision Magazine may be purchased on an annual basis at Subscriptions are set to auto-renewal annually to receive both issues of Collision during a given year. After the first year, and before the auto-renewal, subscribers may cancel their recurring subscription. Subscriptions set annually by a single year Purchase Order have to be renewed manually once a year.

If I subscribe to Collision Magazine in digital format can I print or download the magazine?

A digital copy subscription is intended for one user only and may only be available to one person/computer on-line through their personal account at Hard copy issues of Collision Magazine are mailed directly to the subscriber. Subscriptions are also available in both the digital and hard copy format for each issue of Collision Magazine.

Can I purchase a back issue of Collision Magazine or an individual article?

Yes, back issues are available in digital format here. Individual articles from back issues may also be selected and added to your digital subscription account at

How is Collision Magazine delivered?

The magazine is delivered to annual subscribers in digital format, hard copy printed format, or both. The digital copy of Collision Magazine can only be viewed or read on-line with a person account here.

How are back issues with digital content like conference test data delivered?

Some issues of Collision Magazine were delivered, in hard copy, with a disk or thumb drive containing digital content from activities such as the ARC-CSI Crash Conference crash tests or the EDR Summit presentations (or even crash test data from the Summit). Given the volume of data to be distributed, the digital magazine portal isn’t capable of handling the volume of bonus data originally delivered on a physical media so, as a back issue which had digital data is purchased, the end user will receive e separate email where that digital content can be downloaded.

How can I submit an article to Collision Magazine?

Collision Magazine is always happy to publish new, insightful and worthwhile articles related to the crash reconstruction community. At our article submission portal, you can submit a proposal for review and potential inclusion in an upcoming issue of Collision Magazine.

I read something I disagree with, can I submit a rebuttal to the article?

Of course. Collision Magazine is open to a “My Turn at the Wheel” where readers can submit more casual articles (something not necessarily technically “heavy”) and we are open to opinion and rebuttal articles in which someone may want to offer an alternative point-of-view on a previously published article. This option is, in many ways, actually the ultimate form of “peer review.”

Are articles in Collision Magazine “peer reviewed?”

In Volume 6,issue 2 of Collision Magazine, you may find “Peer reviewed papers, the SAE and Collision Magazine- mutually exclusive concepts?” by W. R. Rusty Haight and in Volume 7, Issue 1, you may find “Peer Review” by Raymond M. Brach, et al. While now a little dated in some ways, both are a good overview of what “peer review” is and isn’t.

At Collision Magazine, we believe in the idea that anything bordering on censorship does little to promote the exchange of new ideas and information. Referencing the content and ideas in the articles above, “peer review” means, simply “evaluation of a person's work by a group of people in the same occupation, profession, or industry.” We believe it is best done by those actually involved in the field, in the technology, in a specific discipline. The larger body of potential “peers" where an opportunity for rebuttal is readily available is the ultimate “peer review” and such is the case with Collision Magazine: anyone can submit a review. While we have select individuals who review content for obvious errors or typos to the extent possible (and mistakes do get through), the larger readership of Collision are in the best position to review an article rather than a hand-picked set of individuals who may be motivated by ideologically or other factors.

How long has Collision Magazine been around?

For more than 16 years, Collision Magazine has been the home of timely and original research for crash reconstructionists. Never the home of “just another article from the internet,” Collision Magazine has always been on the cutting edge of new and fresh papers and articles with a demonstrably real value for the readership no matter their background or level of training.

Get Published in Collision Magazine

Collision Magazine features original, cutting edge articles and papers. If you have an unpublished article or would like to submit a challenge or rebuttal to a previously published article, click on the link below to start your submission.