The Traffic Accident Reconstruction Origin -ARnews-


Re: Speedometer Locked in Position Following a Collision

Dave Lohf (dlohf@ibm.net)
Sat, 7 Feb 1998 21:01:49 -0500 (EST)

My hat is off to the creation of this thread....the poem is priceless (but, he DOES need to get out more often). I built a box that would allow only ultra-violet light inside and mounted a camera on top of the box. I used the camera to take photos using various exposure times of speedometers which were bathed in the ultra-violet light. Once in a great while (emphasis on great while), it was possible to see evidence of the needle "slap". I noted that several things had to have occurred. First, the impact had to be almost fully head-on; second, there could be no pre-impact skidding because if the wheels are locked up, there is no indicated speed; and third, the needle had to be coated with fluorescent paint.

I gave up on the idea after the manufacturers quit cooperating and began using plastic needles. It appears that, if one uses a verrrrry sophisticated box, we can still find evidence of needle contact with the speedometer face. The problem of unreliability remains very much in the forefront. No doubt, we all have encountered speedometer needles stuck in various attitudes and cannot provide adequate explanation as to how the needle got there. Impact speed may be one way, but, there are several other explanations available.

It's all too much trouble for too little result. I gave up on the idea long ago.
Dave Lohf
dlohf@ibm.net


NOTE: You are reading in an archived session of ARnews. It is possible that this topic is still being discussed. To see if this topic is still active, or of there were any more recent posts on this topic, check later archives of ARnews.

If there is no current post, and you would like to add to this topic, link to the Current ARnews Discussion and begin a new thread. Be sure that if you are starting a new post that the thread title does not contain the abbreviation RE: Placing RE: at the beginning of a new post will confuse Hypermail and prevent others from answering your post in the future.

For example, to continue this discussion look for a thread titled

Speedometer Locked in Position Following a Collision

If this thread does not exist in the current archive, you can begin another one by using that title.


8:58 -0600 (MDT)
  • Account Over Due
  • ACTAR Board Meeting
  • ACTAR EXAM
  • Advice on entering the Accident Reconstruction field
  • Air Bag Deployment Failure
  • Air bag deployment in rear end crash
  • air bag identification
  • Air Bag, Frontal Pole Impact
  • Air bag, late deployment
  • Air bag, non deployment
  • Airbag cars SDM recorders
  • Airbag Chemicals
  • Airbag Deployment Death
  • Airbag injuries
  • Airbag injuries,Dangers
  • Airbags
  • AIRBORN PEDESTRIANS
  • Airborne Formulae
  • Aircraft Crash Investigation Training
  • Ambien, Lipitor, Nexium, Paxil, Phentermine, Viagra, Vioxx, Xanax - Limited Time
  • Ambien, Lipitor, Nexium, Paxil, Phentermine, Viagra, Vioxx, Xanax and more Prescribed ...
  • amputation railroad incident
  • An invitation has been sent to you.
  • Anatomical averages
  • Angles from photo
  • Animation Software
  • annoyance
  • Anti-freeze on front tires-can tire marks be made on centerline?
  • antonio lope
  • Any way to stop all this SPAM on this site
  • Anyone teaching grade crossing crash investigation?
  • Appropriate parameters for roll/stability model
  • AR electronic book now available
  • AR Requirements
  • Are there accident simulation programs?
  • ARnews Frequently Asked Questions
  • arnews@tarorigin.com - RE: refinance-now even with bad-credit
  • Automobile Bumper Specs
  • Automotive Black Boxes
  • Autosketch Version 6
  • average averred
  • Award for Recognization Submissions
  • Backhoe accidents on public thoroughfares/auto involved and serious head injury to young boy pas
  • Backhoe accidents on public thoroughfares/auto involved and serious head injury to young boy passeng
  • BARZELEY and LACEY EQUATION
  • Beam Pattern Data
  • BERZELEY and LACEY EQUATION
  • Best rates- as low as 2.95%
  • bicycle acceleration rate
  • Bicycle Drag Factor
  • Bicyclist thrown after impact
  • Big Profits on Foreclosed Properties
  • biodegradable solution to lower friction on skidpad
  • Black Box Data on 1997 GM Pickup Truck
  • Black Box Research Paper
  • Black Boxes - Who Owns The Data?
  • Boat Accident Reconstruction
  • Brake Booster Failure
  • BRAKE FADE IN POLICE VEHICLES DURING PURSUIT DRIVING
  • Brake Fluid Reflux Boiling Point
  • Brake Lag at Slow Speeds
  • Brake Misap. in Blazer: Gas-Brake Height Difference?
  • Brakes on Trucks
  • Braking ratio's for motor cycles
  • Brand new wet asphalt coefficient of friction
  • British Pendulum Test to Measure Coefficient of Friction of Crack Sealant
  • Bumper gun
  • Bus acceleration rates
  • Bus Weights
  • C.h.eape.s.t Software Store! 2P
  • C.h.eape.s.t Software Store! 8c
  • cady
  • California EDM Law
  • Can we tell if brakes were on during rear-end collision?
  • Canadian Motor Vehicle Specifications
  • Canadian Vehicle Specs
  • Canadian Vehicle Specs Program 2001.1 available
  • car accident fires
  • Car Black Boxes
  • Car color frequency
  • Car fire
  • Car hitting a bike: Lateral or back impact?
  • car window spontaneously explodes
  • Carpal Tunnel following automobile collisions
  • carrie
  • Cash In - 25 Dollars - 6
  • Cdn Vehicle Specs 2003
  • Certified bicycle inspection
  • chaperone disruptive
  • Civil Payment
  • Coefficient of Friction
  • Coefficient of Friction factors for side sliding
  • Coefficient of Friction for grass
  • Coefficient of friction for road surfaces
  • Collision Avoidance Manuevers
  • Collisions related to non-repaired recalls?
  • Combined speed equation use
  • combing airbag deployment threshold speed
  • Combining Speeds
  • Comment needed on dead-center pole-impact, end-over-end
  • Commercial Drag Sled Now Available
  • Commercial Vehicle Braking Efficiency
  • Commercial Vehicle Reconstruction Conference
  • Commerical Recycle Truck Roll Over
  • Commericial 30 minutes showing 10-12 pedestrian collisions
  • Common Coefficient of Friction for two vehicles post impact in a collinear collision.
  • Computer program on ped flight after being struck by a front tire of a bus
  • computer programms on accident reconstruction
  • Concussion tolerance
  • confident?
  • confuse
  • Conservation of Momentum combined with Barrier Crush Speeds
  • Controlled cholesterol. pewupekzhsteb
  • Converting Autosketch Accident Symbols to Autocad LT
  • coquina
  • Cost of Creatng an Accident Reconstruction Animation
  • Crack for TOPCON Total Station with 'CivilCad' Software
  • Crash Attenuators
  • Crash Data
  • Crash test videotape material
  • CRASH ZONE USERS
  • Create a new income with eBay... primpcavilling x lc dlh em kua q
  • Critical speed scuff on berm
  • Critical Speed Yaw without a crossover point
  • Critical speed, variables for older VW's (rear engine, cambered wheels)
  • Crush Stiffness Coefficients
  • Crush Stiffness Data
  • cuff
  • CVS 2000-1
  • DART Drag Sled
  • Dateline Program on the use of GPS to prove the movement of a vehicle
  • Dealz of the dayz
  • Deceleration rates during a yaw
  • DeltaV: Speed, weight, momentum
  • Determining Motorcycle speed w/ skid marks collision
  • determining speed for vehicle in lateral impact with resulting rollover
  • diathesis frazzle hacienda
  • Digital Photograph admissibility
  • Discovery Channel: Unsolved Mystery (Princess Diana death in car crash)
  • Does the type of bumper effect the drivers injuries in a 40 mph rear end crash
  • dogging
  • Don't be left out
  • Don't Make m0rt_gage Mistakes! colloquium
  • Door latch failure
  • Dose the type of bumper effect the drivers injuries in a 40 mph rear end crash
  • DOT Tire Numbers
  • DOT Tire Numbers utbbtj4314
  • Dr. Wright and WinCRASH - The rest of the story.
  • DRAG FACTOR
  • Drag factor adjustments
  • Drag Factor for flat tires
  • Drag Factor for loaded tractor-trailer
  • Drag factor of Sliding Motorcycle
  • Drag Factor of tumbling motorcycle
  • Drag Factors for Wet Streets
  • Drag Sled
  • Drag Sled Development
  • DRAG SLEDS
  • Drag while tumbling in 2"-deep snow
  • Drift Angle
  • driscoll
  • Driver liability for passenger riding outside of vehicle, falling, dying
  • Driver or Passenger?? Side Impact Collision - Unrestrained
  • Driver's ability to estimate speed while driving a vehicle
  • Dynacop cad software
  • Easy and smart discounted OEm software! ty
  • Easy? Speed before slide
  • Ebay notification - your auction has completed successfully " smutdjbbhrljxc
  • EDCrash on Parked Car
  • EDCRASH Usefull speed change range
  • Education
  • Effect of chain link fences
  • Effect of Studded Tires in Critical Speed determination
  • Effects of override on Momentum workups
  • Electronic Odometers
  • email forum
  • Embarrassed? Not any more! hecuba esoteric cheater
  • Energy calculation - motor cycle crush
  • Energy to Rollover
  • Enl.arge up to 3"
  • erroneous airbag deployment
  • Expert in the field of Automobile & Transmission
  • Extend your piece of mind
  • F350 with gooseneck trailer speed at beginning of skikmarks
  • Fairground ride acceleration data
  • Fatal Motorcycle crash
  • Fire/Police Officer Struck
  • Flop Formula
  • Ford Expedition's All Wheel Drive Controlability Problems
  • Ford Explorer or Mercury Mountaineer accidents caused by tire defect other than Firestone
  • forensic analysis of tyre compound`
  • Forensic Animation Classes offered
  • Forensic kinetics/biomechanics for pedestrian at side of car
  • Forensics category
  • Forward Projection Vs. Wrap
  • Frances, Just Re|eased - Digita| _Cab|e Descramb|er sanctity steprelation
  • FREE - Canadian Vehicle Specs Ver 2002.2
  • FREE Railroad Crossing Collision Investigation Class
  • Freightliner Spec's
  • friction coefficient of studded tires on dry asphalt
  • Friction of Timber bridge decks
  • FRICTION PROBLEMS ON PAVEMENT MARKINGS
  • front steering
  • Frontal Impact Advice
  • frontiersmen
  • Fudicial marks
  • Fw: Application fdlts Declined fzji
  • Fw: Check this out - Portable, region free DVD under $300 ... FAMSYI
  • Fwd: All Pills Stocked. Xan_a_x.V*a*lium.Vcodn.v1@GRa.LEVQOAVU
  • Fwd: Deep Discounts. All prescriptions filled. V:a:lium.'V1codin.v:agr@.X:A:Nax.LACLRVAH
  • Fwd: Deep Discounts. Safe Shopping. x@nax.V-a-lium.V1codin*.V|agr@.QGTJZKHD
  • Fwd: Doctors not needed. No Appointments. V1co'din.V1AGr@.X@nax.Va*l*ium.PSQLKKHX
  • Fwd: Got Meds. V;a;lium.V1cod1n.V!@gra.xana!x!.NFBAGHYD
  • Fwd: Got V-a-lium.;V1codin.v:agR@.XA~N~Ax.GYMWOGMN