McHenry Forum - Crash Reconstruction & Simulation

Video recently saw on Linkedin and so post up here for future reference: From a thread called Learn Engineering: Includes the description of the Seatbelt video: Everybody knows what happens in an accident if you don’t wear a seatbelt. What you see in this accident looks really painful in slow motion...

From BBC: Drivers to be banned from picking up mobile phones which begins: It will become illegal for anyone to pick up and use their mobile phone while driving, under new legislation to be enacted next year. The change will end a loophole that can allow drivers to escape punishment for using a hand...

Recently saw this on Linkedin and so posting up for future references (Linkedin won't let you link to the original poster??!!): Failing to consider proper weight distribution when pulling any sort of trailer can quickly result in your situation swaying completely out of control, ending in incident a...

Oct 2020A: Postings on INCR included the following references: I preface this list with the conclusion from a reference above... In general, the practice of representing a residual speedometer reading as that vehicle’s speed at impact is strongly cautioned against. Speedometers and Collision Reconst...

Couple of articles on Automatic Braking and issues with "Phantom" braking, etc. When investigating a crash any influence or actions by any automatic steering or braking (if it is an option on either vehicle involved in the crash) must be investigated. Wired Magazine: Split-Second ‘Phantom’...

A query about potholes came up and so i did an initial review of the pothole paper (SAE 2015-01-1572) and unfortunately it does not include any full-scale tests (see Summary/Conclusion 5) and an important missing element is what shape/size might cause de-beading/air-out? The study does include an im...

Sept 30 2022: this topic split off from related topic What is Restitution? (w/r to Vehicle Collisions) Sept 2020: As part of the NAPARS facebook page presentation Today: An NCAP Report, Part5, Restitution they included NHTSA Crash test #10156 which was a 2018 Chevrolet Traverse 4D SUV 35 MPH barrier...

Please also see

• Can the Coefficient Of Restitution be Negative?

In a recent post on the NAPARS facebook page which was presenting what type of information is contained in NHTSA Crash test database reports they presented results from test #10156 which was a 2018 Chevrolet Traverse 4D SUV 35 MPH barrier crash. As part of the section on restitution (they have daily...

This topic came up on the NAPARS facebook page so i added a couple other sources for the definition: Oxford Reference The coefficient of restitution always satisfies 0<=e<=1. When e=0, the balls remain in contact after the collision. When e=1, the collision is elastic: there is no loss of kinetic en...