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All files are in Adobe PDF format except as noted.

• Crush Analysis with Under-rides and the Coefficient of Restitution
  A presentation given at IPTM's Special Problems 2006 Conference that covers damage momentum and damage energy techniques. Also, the relationship between the coefficient of restitution and the amount of energy dissipated in a crash is presented.
  Filesize: 1.6 MB
  Date Revised: 27 April 2006
   
• Range Estimation of a Variable
  An Excel spreadsheet designed to determine a range to use in a reconstruction based on any set of data. The analysis assumes the variable follows a normal distribution with an unknown mean and unknown standard deviation. The final distribution and its confidence interval is determined using a bootstrapping technique. The latest revision includes the mean (average) +/- the interval. The spreadsheet requires no additional add-ons.
  Filesize: 1.6 MB
  Date Revised: 20 September 2005
   
• Presentation on the Range Estimation of a Variable (Excel sheet User Guide)
  The handout, including examples, initially presented at the 2005 IATAI conference in Springfield, Il. that describes the theory used in estimating a range based on sampling statistics.
  Filesize: 1.42 MB
  Date Revised: 20 September 2005
   
• Critical Speed Yaw Analysis Presentation
  A presentation that illustrates the basic concepts of determining speed from a critical cornering manuver.
  Filesize: 509 KB
  Date Revised: 7 September 2005
   
• Rollover Analysis Presentation
  A presentation that defines terms, examines evidence, and provides an overview of some analysis for rollover crashes.
  Filesize: 2.17 MB
  Date Revised: 7 September 2005
   
• Energy Methods for Pole Impacts
  A presentation describing the basics of energy quantification for impacts with poles and fixed objects. Presentation originally given at the 2002 IATAI Conference. Latest update for the 2005 SCARS conference.
  Filesize: 667 kB
  Date Revised: 29 July 2005
   
• Analysis of Four Staged Crashes of Passenger Vehicles ino a Semi-Trailer
  This paper was initially presented as the reconstruction of the crash tests conducted for IPTM's Special Problems 2005 conference. The paper discusses both inline momentum and angular momentum solutions for determining the initial speed of the bullet vehicle.
  Filesize: 4.3 MB
  Date Posted: 29 July 2005
   
• Commercial Vehicle Testing
  This is a summary of testing performed at the Wyoming Law Enforcement Academy by John, Jeremy and Nate Shigemura. It contains the result from skid testing, lane change manuevers, acceleration and Jake brake performance.
  Filesize: 911 kB
   
• A Study of Lateral Vehicle Motion
  A presentation for Special Problems 2004 of testing and analysis of lateral vehicle motion. Includes derivation of critical speed yaws, interpretation of evidence, analysis of lane changes, and the Dynamic Roadway Marking System, (DRMS).
  Filesize: 1.4 MB
   
• Multiple Vehicle Collisions: An Application of the Monte Carlo Method (Paper)
  This paper was presented at ITPM's Special Problems in 2004 by John and Jeremy. It covers the Motecarlo method for a case styudy involving multiple vehicle collisons. An overview of the probability theory is also presented.
  Filesize: 333 kB
   
• Multiple Vehicle Collisions: An Application of the Monte Carlo Method (Presentation)
  This presentation compliments the above paper.
  Filesize: 2.6 MB
   
• Rotational Mechnanics
  This presentation covers the application of the concepts of rotational mechanics applied to traffic crash reconstruction.
  Filesize: 447 kB
   
• Critical Speed Yaw Anaysis and Testing
  A presentation designed to augment the course material for Traffic Crash Reconstrution. This presentation shows the results of testing from four classes John has taught.
  Filesize: 4.0 MB
   
• Derivation of the Airborne Speed Formula
  A presentation to augment the Crash Reconstruction class on the derivation of the Airborne speed equations. Written by Gerry Murphy.
  Filesize: 323.42 Kb
   
• Drag Factors in Spins and Hills
  A presentation designed to agment the course material in Traffic Crash Reconstruction. The focus os on how to properly adjust for a drag factor for hills and rotating vehicles. Examples are from real cases.
  Filesize: 242.51 Kb
   
• Introduction to Statistics
  The slide show given as an introduction to descriptive statistics for accident investigators. First given by Jeremy Daily to a class in West Chester, Ohio in 2003.
  Filesize: 392.58 Kb
   
• Introduction to the Monte Carlo Method
  A presentation outlining the Monte Carlo simulation method with example of a combined speed equation. First given by Jeremy Daily to a class in West Chester, Ohio in 2003.
  Filesize: 112.30 Kb
   
• Investigating the Aggrivated Vehicular Homicide
  This is a presentation originally given to Wyoming procecuting attorneys on the importance of a quality investigation of a vehicular homicide.
  Filesize: 4.20 MB
   
• Linear Momentum Analysis Using Vectors
  A linear momentum presentation solved both mathematically and graphically. Written By Nathan Shigemura in 1999.
  Filesize: 622.23 Kb
   
• Practical Evidence Interpretation
  Practical Evidence Interpretation, Keeping it Simple is a presentaiton given by John Daily and Nathan Shigemura at IPTM's Special Problems in 2001.
  Filesize: 3.21 MB
   
• Testing and Correcting For Drag Factors
  A presentation to supplement IPTM teaching documents on the testing and Correcting Drag Factors.
  Filesize: 1.40 MB