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NCJ Number: 63356 Add to Shopping cart Find in a Library
Title: MARYLAND - COLLISION MANAGEMENT PROCEDURES, PART 7 ESTIMATING SPEED FROM THE PHYSICAL EVIDENCE
Author(s): ANON
Corporate Author: Maryland Police Training Cmssn
United States of America
Date Published: 1975
Page Count: 19
Sponsoring Agency: Maryland Dept of Transportation

Maryland Police Training Cmssn
Pikesville, MD 21208
US Dept of Transportation National Highway Traffic Safety Admin
Washington, DC 20590
Publication Number: PT 75 471-4
Type: Training (Handbook/Manual)
Format: Document
Language: English
Country: United States of America
Annotation: THIS TRAINING UNIT IS DESIGNED TO PROVIDE THE STUDENT WITH EXPERTISE IN ESTIMATING VEHICULAR SPEED FROM PHYSICAL EVIDENCE AT THE COLLISION SCENE.
Abstract: OBJECTIVES OF THE TRAINING UNIT INCLUDE IDENTIFICATION OF FACTORS RELATED TO ESTIMATING VEHICULAR SPEED SUCH AS VEHICULAR DAMAGE AND SKIDMARKS. SKIDMARKS CAN YIELD SUCH INFORMATION BY CALCULATION/DETERMINATION OF DRAG FACTOR, CALCULATION OF PERCENT OF GRADE, AND DETERMINATING SPEED BY MEANS OF CALCULATION AND USE OF THE 'SPEED NOMOGRAPH.' THE LENGTH OF SKIDMARKS NEVER INDICATES ALL OF THE VEHICULAR SPEED PRIOR TO THE COLLISION. THE VEHICLE IS ALWAYS GOING FASTER THAN THE SPEED INDICATED BY THE SKIDMARK; IT CAN LOSE SPEED IN ONE OR MORE OF THE FOLLOWING WAYS BEFORE STOPPING; (1) BRAKING WITHOUT SKIDDING; E.G., BEFORE THE SKID BEGINS, DURING GAPS IN SKIDMARKS, AND AFTER SKIDMARKS END; (2) SKIDDING WITH ONE OR MORE WHEELS BEFORE A SKID BECOMES APPARENT; (3) STRIKING OBJECTS ENROUTE TO THE SKID OR COLLISION; (4) STRIKING AN OBJECT IN THE FINAL COLLISION; AND (5) VAULTING OR ROLLING. WHEN A SKID TERMINATES IN A COLLISION, THE SPEED LOST DURING THE SKID MUST BE COMBINED WITH THE SPEED LOST DURING THE COLLISION TO ESTIMATE THE SPEED BEFORE THE SKID BEGAN. ALSO EXPLAINED ARE HOW TO OBTAIN THE LENGTH OF THE ACCIDENT SKID USING FIELD MEASUREMENTS; HOW TO DETERMINE THE DRAG FACTOR FOR SKIDDING TIRES; HOW TO DETERMINE THE SKID RESISTANCE FOR SKIDDING TIRES; AND HOW TO DETERMINE THE MINIMUM SPEED FOR THE ACCIDENT SKIDMARK. FORMULAS, THE SPEED NOMOGRAPH, AND A TABLE ARE INCLUDED, AS WELL AS A QUIZ. (PRG)
Index Term(s): Accident investigation; Evidence identification; Maryland; Shoe prints and tire tracks; Traffic accidents; Traffic law enforcement training
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http://www.ncjrs.gov/App/publications/abstract.aspx?ID=63356

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