Ruhl Forensic Leader in Forensic Technology

Publications

Technical Papers


SAE 2013-01-0785
The Accuracy of Pedestrians in Estimating the Speed of a Moving Vehicle

Mark Strauss, James Carnahan, and Roland A. Ruhl

This study was performed in order to evaluate the accuracy with which pedestrians estimate the speed of nearby automobiles. A total of 87 subjects were involved in this experiment, with 487 useful speed estimates being obtained from them. The vehicle speeds were measured using radar guns, and the moving cars were located upstream, downstream, and adjacent to the subjects. A survey form was used to obtain attributes about each subject. A multivariate regression was used to allocate portions of the variation in the percent error among the various factors that describe the subject and the moving vehicle. Statistical significance was discovered for the main effects and some interactions among: gender, driving experience, a self-assessment of ability to estimate such speeds, the use of the posted speed limit, the speed of the target vehicle, and the location of the vehicle on the roadway. The implications for speed estimation accuracy are presented, both for categories of subjects and for individual subjects. The standard deviation in the accuracy of individuals was remarkable for its large magnitude and its persistence over all the categories of subjects and also the different vehicle speeds and locations.

Mark Strauss
mgstrauss@ruhl.com


Technical Papers

SAE 2013-01-0785
The Accuracy of Pedestrians in Estimating the Speed of a Moving Vehicle

SAE 2010-01-0046
Observed Errors in Distance Estimation

SAE 2007-01-0758
The Experimental Study of the Air Flow Produced by Road Vehicles and its Potential Destabilizing Effect on Nearby Pedestrians

SAE 2006-01-3557
Usable Models for Free and Forced Cooling of Commercial Vehicle Drum Brakes

SAE 2006-01-3556
Comparison of Established Heavy Brake Heating / Cooling Models with HVE Brake Designer in a Real Mountain Accident

RF2005-01
Commercial Vehicle Onboard Electronics - Global Positioning Systems, Engine Control Modules and Safety Systems and Devices

IMECE2004-59566
Analysis of a Common Cause Hypothesis in a Forensic Product Defect Analysis

SAE 2004-01-2717
Safety Concerns in Automatic Control of Heavy-Duty Articulated Vehicles

SAE 2003-01-3393
Numerical Methods for Evaluating ECM Data in Accident Reconstruction and Vehicle Dynamics

SAE 2003-01-3363
Development of a Dynamic Model of an Air-ride Seat for On-highway Trucks

SAE 2003-01-3419
Simulation of Intelligent Convoy with Autonomous Articulated Commercial Vehicles

SAE 2002-01-3104
Factors Affecting the Friction Coefficients Between Wooden and Plastic Pallets and the Wooden Floor Of A Van-type Semi-trailer

SAE 2002-01-1566
Overview of Carat-4, a Multi-body Simulation and Collision Modeling Program

SAE 2001-01-2755
Factors Affecting the Friction Coefficients Between Wooden Pallets and the Wooden Floor of a Van-type Semi-trailer

SAE 2000-01-3476
Fluid Load Analysis Within the Static Roll Model

RF2000-01
The Post-Kumho Exclusion of a Traffic Accident Reconstruction Expert

SAE 1999-01-3782
A Prototype Computer Based Test System to Test Commercial Vehicle Air Brake Systems: Application and Test Results

SAE 1999-01-3732
Dynamics and Roll Stability of a Loaded Class 8 Tractor-Livestock Semi-Trailer

SAE 973261
Prediction of Steady State Roll Threshold for Loaded Flat Bed Trailers - Theory and Calculation

SAE 971033
Ventilated Brake Rotor Air Flow Investigation

SAE 900106
Skidmark Signatures of ABS-Equipped Passenger Cars

SAE 880066
Combining Scene Data with Trajectory Information for Effective Accident Simulation