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NCJRS Abstract

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NCJ Number: 65920 Find in a Library
Title: SPEEDOMETER EXAMINATION - AN AID IN ACCIDENT INVESTIGATON
Journal: FBI LAW ENFORCEMENT BULLETIN  Volume:49  Issue:3  Dated:(MARCH 1980)  Pages:11-15
Author(s): D STONER; I ZELDES
Corporate Author: Federal Bureau of Investigation
US Dept of Justice
United States of America
Date Published: 1980
Page Count: 5
Sponsoring Agency: Federal Bureau of Investigation
Washington, DC 20535-0001
National Institute of Justice/
Rockville, MD 20849
Sale Source: National Institute of Justice/
NCJRS paper reproduction
Box 6000, Dept F
Rockville, MD 20849
United States of America
Document: PDF
Publisher: https://www.fbi.gov 
Language: English
Country: United States of America
Annotation: SPEEDOMETER AND TACHOMETER INVESTIGATIONS TO HELP DETERMINE VEHICLE SPEED AT IMPACT ARE DESCRIBED AND SUGGESTIONS FOR REMOVING AND HANDLING SUCH EQUIPMENT ARE GIVEN.
Abstract: BECAUSE SKID MARKS ARE NOT ALWAYS LEFT AT THE SCENE AND BECAUSE DAMAGE ESTIMATES DEPEND MORE ON GUESS THAN ON OBJECTIVE CACULATION, BOTH KINDS OF INVESTIGATIONS ARE LIMITED. VEHICLE SPEED AT IMPACT CAN SOMETIMES BE DETERMINED BY EXAMINING THE SPEEDOMETER, TACHOMETER, AND TACHOGRAPH. HOWEVER, A DIRECT SPEEDOMETER READING OF A STUCK NEEDLE AFTER AN ACCIDENT MAY NOT BE RELIABLE, PARTICULARLY IF THE READING IS AT OR NEAR ZERO. IN SEVERE HEAD-ON OR FIXED-OBJECT COLLISIONS, THE SPEEDOMETER NEEDLE MAY MAKE A VISIBLE STAMP OR MARK ON THE DIAL. AT OTHER TIMES, THE DRIVER'S BODY OR OTHER OBJECTS MAY COME IN CONTACT WITH THE SPEEDOMETER DURING COLLISION, BENDING THE NEEDLE AND CAUSING IT TO PUSH AGAINST THE DIAL. IF THE NEEDLE STICKS AND THE DAMAGE IS RELATIVELY STRAIGHT FROM FRONT TO REAR, THE VEHICLE IMPACT SPEED MAY BE DETERMINED, AND SUBSTANTIATED BY DAMAGE AND OTHER EVIDENCE. OTHER SPEED DETERMINATORS INCLUDE PAINT SMEARS ON THE DIAL LEFT BY THE NEEDLE AT THE TIME OF IMPACT AND TACHOGRPAH AND TACHOMETER FINDINGS. SPEEDOMETERS SHOULD BE PHOTOGRAPHED BEFORE REMOVAL, HANDLED GENTLY, AND REMOVED WITH THE COMPLETE INSTRUMENT PANEL, IF POSSIBLE. AN EXAMINATION REQUEST SHOULD ACCOMPANY THE SPEEDOMETER TO THE LAB, ALONG WITH A BRIEF ACCOUNT OF THE ACCIDENT, ANY SPEED CALCULATIONS, AND OTHER PERTINENT DATA. THE LABORATORY EXAMINATION CONSISTS OF OBSERVATION, MICROSCOPIAL ANALYSIS, AND PHOTOMICROGRAPHY UNDER NORMAL LIGHTING CONDITIONS AND ULTRAVIOLET (UV) LIGHT. IN SOME CASES, IT IS MORE DIFFICULT TO TAKE A PHOTOGRAPH OF VERY SMALL PARTICLES UNDER UV LIGHT THAN IT IS TO OBSERVE THEM. PHOTOGRAPHS ARE INCLUDED. (AOP)
Index Term(s): Accident investigation; Crime laboratory equipment; Photography; Shoe prints and tire tracks; Traffic accidents
To cite this abstract, use the following link:
http://www.ncjrs.gov/App/publications/abstract.aspx?ID=65920

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