Vegas Lawyer
Helping People Who
Were Hurt In Nevada

Dempsey, Roberts
& Smith, Ltd.
Attorneys-At-Law



Las Vegas Lawyers
Nevada Legal Help



Home
Car Accidents
Death Claims
Slip & Fall
Medical Injury
Product Defect
Other Claims
Contact Us

Las Vegas Lawyers

Vegas Injury Law

Welcome to Vegas Lawyer. This site is for people who were hurt in Nevada. Contact us for a free consultation. You may want to read the Las Vegas Personal Injury Law introduction on our home page. Also, you can get an overview of other claims like Wrongful Death, Auto Accidents, Slip & Fall, and Products Liability before you explore the Article below.

Click Above Or Below To Go To Vegas Lawyer:
vegaslawyer.net









Accident Reconstruction/Simulation

Introduction

In 1997, 42,000 people were killed in highway accidents in the United States. The exact cause of an accident is often unknown and, therefore, conclusions relating to the safety afforded by the vehicle to the occupant cannot be made. In addition, safety hazards in the highway environment are often not discovered due to the lack of information. Accident reconstruction is a tool commonly used by the National Transportation Safety Board (NTSB) to investigate the accident sequence, but data are often lacking and accurate reconstructions are difficult and time-consuming. Because many assumptions are made in this process, the reconstruction is not exact, making it difficult to accurately predict occupant kinematics and to identify potential safety hazards within the vehicles. Vehicle recorders would eliminate much of the guesswork involved in reconstructing accidents, enabling a more accurate assessment of occupant injuries, driver performance, and safety hazards within and around a vehicle.

Vehicular Data

Much information concerning the accident vehicles is needed to reconstruct an accident accurately. This information includes both driver inputs and vehicle outputs. The driver inputs would include steering angles; application of brakes and throttle; gear selection; engine braking; and use of lights, turn signals, cruise control, wipers, and horn at various increments prior to and during the accident sequence. Information is also necessary on driver restraint use and occupant seating location. The vehicle output parameters that are needed include the pre-impact speed, engine rpm and gear selection, acceleration history, braking efficiency, the use of cruise control and anti-lock braking systems, and activation of passive restraints.

Typically in highway accidents, the driver inputs and the vehicle outputs are derived from witness statements, or physical evidence such as the impact location, tire marks, and the final resting position of the vehicles. Unfortunately, witness statements are often in conflict, biased, and perhaps based on past experience, adding confusion to variables such as initial speed or speed at impact. Further, the accident typically occurs within 0.10 seconds, a speed at which witnesses cannot always accurately comprehend vehicle interactions. Furthermore, physical evidence can be limited if road conditions are not ideal or if evidence is not collected immediately after the accident.

Methods for Accident Reconstruction and/or Simulation

Several programs have been developed to aid in accident reconstruction/simulation. These developers include McHenry Software (m-smac,m-hvosm, m-crash, ATB/cvs); Engineering Dynamics, Inc. (EDCRASH (reconstruction), EDSMAC, EDVDS, EDVSM, EDHIS, EDVTS, EDGEN); MacInnis Engineering (PC-Crash); Mechanical Simulation Corporation (TruckSim, AutoSim); AR Software (Slam, WinSMAC); Accident Reconstruction Software (REC-TEC); Fonda Engineering Associates (CRASHEX); and others. These programs use the driver inputs and the vehicle outputs to reconstruct/simulate the accident. Crash pulses detailing the acceleration-time history of a vehicle can be calculated from these inputs, the damage profiles of the vehicles, and the vehicle stiffness.

Human Performance: Recorded information could help investigators determine the drivers' actions before and during the accident. These inputs will help to refine the vehicle and occupant dynamics during the accident. The recorded information may also help to assess if the driver was fatigued, impaired, or not making evasive maneuvers. For example, a lack of steering reversals may indicate fatigue. Such information will help to assess countermeasures for preventing accidents.

Biomechanics: Once accurate information on vehicle performance and driver response is known, the reconstruction may then be used to assess occupant kinematics and occupant protection within the vehicle. The more accurate the vehicle dynamics, the more accurate the occupant simulation. Better occupant simulation will result in more effective design changes that improve occupant safety.

Accident Reconstruction Examples

Collision of a Van and a Train:

Event recorders may be used to facilitate the accident reconstruction process. For example, in 1998 in Wagner, Oklahoma, a van was struck in the rear by a train. Witnesses in the van reported that the driver stopped at the railroad crossing and then proceeded into the crossing. The train engineer reported that the van did not stop at the crossing. An event recorder was present on the train, so the train speed at impact was known to be 46 mph. Based on the damage profile on the van and the final resting location of the van, reconstructionists at the NTSB varied the speed of the van at the point of impact to determine the most accurate trajectory and the related initial speed of the van.

The conclusion drawn, based on the reconstruction, was that the van had to be traveling about 35 mph at impact to sustain the damage and reach the final resting location. The train's event recorder enabled this iterative process to occur. Without the recorder, there would have been an infinite number of train and van speed combinations that would have resulted in a similar damage profile and rest location for the van. Furthermore, the cause of the accident would have been unknown and potential safety hazards might not be identified.

Collision of a Tractor Semi-Trailer and a School Bus:

Another simulation being developed by the NTSB involves a school bus that was struck from behind by a tractor semi-trailer in Holyoke, Colorado, in 1998. Vehicle recorders would have greatly helped the simulation and reduced the number of simulation runs required. A bus recorder would have indicated if the bus was stopped or had just started to accelerate when struck by the truck. A truck recorder would have provided information on the truck's initial speed, gear in use and rpm, when the truck driver started to brake, how hard he braked, and which brakes (semi-trailer only or full truck) he initially used. The driver added steering input just before the crash; knowing when he started to steer and the rate at which he steered would have helped in the simulation. Furthermore, both bus and truck driver inputs prior to the crash would help determine a potential cause of the accident.

Summary

Accident reconstruction/simulation is a difficult and time-consuming process. Event recorders not only simplify the reconstruction process, but they also increase the accuracy of the reconstruction resulting in more detailed conclusions concerning safety.

This information came from an
NTSB online article.

*** Any law, statute, regulation or other precedent is subject to change at any time ***

Index | Home

Contact David Matheny, Esq. for a free consultation.

(702) 388-1229










Search for more information on Vegas Law and Las Vegas Lawyers:

Google







Dempsey, Roberts
& Smith, Ltd.

Nevada Lawyer
Nevada Accident
& Injury Law
















Vegas Lawyer
Nevada Accident
& Injury Law

Index | Home

Wrongful Death | Car Accident | Slip & Fall | Malpractice | Product Defect | Other Claims






DEMPSEY, ROBERTS & SMITH, LTD.
520 South Fourth Street, Suite 360
Las Vegas, Nevada 89101

Las Vegas Lawyer - Las Vegas Attorney - Las Vegas Personal Injury Lawyer

A Lawyer In Las Vegas Can Assist You If You Need Any Of The Following:

Las Vegas Lawyers
Las Vegas Personal Injury Lawyers
Las Vegas Injury Lawyer
Las Vegas Accident Lawyer
Las Vegas Car Accident Lawyer
Las Vegas Auto Accident Lawyer
Las Vegas Wrongful Death Lawyer
Las Vegas Fatal Accident Lawyer
Las Vegas Lawyer
Las Vegas Law Firm
Attorneys
Personal Injury Attorney
Injury Attorney
Accident Attorney
Car Accident Attorney
Auto Accident Attorney
Wrongful Death Attorney
Fatal Accident Attorney
Attorney
Lawyer Help
Lawyers In Las Vegas
Personal Injury Lawyer In Las Vegas
Injury Lawyer In Las Vegas
Accident Lawyer In Las Vegas
Car Accident Lawyer In Las Vegas
Auto Accident Lawyer In Las Vegas
Wrongful Death Lawyer In Las Vegas
Fatal Accident Lawyer In Las Vegas
Lawyer In Las Vegas
Legal Help
Death Claim Lawyer
Car Wreck Lawyer
Vehicle Accident Lawyer
Dangerous Product Lawyer
Defective Product Lawyer
Product Liability Lawyer
Premises Liability Lawyer
Slip & Fall Lawyer
Medical Malpractice Lawyer
Attorney Help
Death Claim Attorney
Car Wreck Attorney
Vehicle Accident Attorney
Dangerous Product Attorney
Defective Product Attorney
Product Liability Attorney
Premises Liability Attorney
Slip & Fall Attorney
Medical Malpractice Attorney
Death Claim Attorney In Las Vegas
Car Wreck Attorney In Las Vegas
Vehicle Accident Attorney In Las Vegas
Dangerous Product Attorney In Las Vegas
Defective Product Attorney In Las Vegas
Product Liability Attorney In Las Vegas
Premises Liability Attorney In Las Vegas
Slip & Fall Attorney In Las Vegas
Medical Malpractice Attorney In Las Vegas




A Las Vegas Lawyer can help you in any area in Nevada, including:

  • Las Vegas, Nevada
  • Henderson, Nevada
  • Battle Mountain, Nevada
  • Carson City, Nevada
  • Dayton, Nevada
  • Elko, Nevada
  • Ely, Nevada
  • Eureka, Nevada
  • Fallon, Nevada
  • Fernley, Nevada
  • Goldfield, Nevada
  • Hawthorne, Nevada
  • Paradise Township, Nevada
  • Laughlin, Nevada
  • Lovelock, Nevada
  • Minden, Nevada
  • Pahrump, Nevada
  • Pioche, Nevada
  • Reno, Nevada
  • Summerlin, Nevada
  • Tonopah, Nevada
  • Virginia, Nevada
  • Wendover, Nevada
  • Winnemucca, Nevada
  • Yerington, Nevada
  • Zephyr Cove, Nevada
  • Spring Valley, Nevada
  • Mesquite, Nevada



  • Neither the State Bar of Nevada nor any agency of the State Bar has certified any lawyer identified here as a specialist or as an expert.  Anyone considering a lawyer should independently investigate the lawyer's credentials and ability. This site is intended for Nevada residents and those with legal issues arising under the jurisdiction of the State of Nevada.  This site does not give legal advice or create an attorney-client relationship.  Laws are different in other states and localities, consult a local attorney.

    The information in this web site is provided for informational purposes only. The information does not constitute legal advice. The use of this site does not create an attorney-client relationship. Further communication with an attorney through the web site and e-mail may not be considered as confidential or privileged. Please contact our attorneys if you wish to discuss the contents of this web site. Any laws, rules or statutes giving any information, restrictions or deadlines, are always subject to change at any time - Contact a local attorney to obtain the current status of such information.

    In the series of Articles on this site, many government PSAs and other information are excerpted. All such materials are believed to be in the public domain. If any work is protected, contact the webmaster at any of the e-mail links and the material will be taken off the site immediately.

    If you experience unusual problems with this site or discover dead links, please email the webmaster. Thank you.

    Copyright: David Matheny, 2003-2005.