JSM 2005 - Toronto

Abstract #304599

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Legend: = Applied Session, = Theme Session, = Presenter
Activity Number: 317
Type: Topic Contributed
Date/Time: Tuesday, August 9, 2005 : 2:00 PM to 3:50 PM
Sponsor: General Methodology
Abstract - #304599
Title: Sensitivity and Specificity of Setting Triggers To Evaluate Continuously-collected Data
Author(s): Jeremy Sudweeks*+
Companies: Virginia Polytechnic Institute and State University
Address: 3500 Transportation Research Plaza, Blacksburg, VA, 24060,
Keywords: sensitivity ; specificity ; continuous data collection
Abstract:

The 100 Car Naturalistic Driving Study was an instrumental vehicle study undertaken in the Washington D.C. Metropolitan Area. Twenty-four leased vehicles and 78 private vehicles were instrumented with video cameras, vehicle state sensors, and kinematic sensors. Data was collected from each vehicle for 12 months, resulting in approximately nine terabytes of video and vehicle data. he data collected corresponds to approximately 2,000,000 vehicle miles and 43,000 hours of driving. In order to identify safety relevant events in the data, such as crashes and near crashes, triggers based on data from the kinematic sensors were developed. These triggers were used to identify video frames for review by individuals trained to evaluate driver behavior. This paper outlines several attempts made at improving trigger specificity by means of discriminant analysis on kinematic variables. Methods employed include linear and quadratic discriminant functions, cost imposition on misclassifications, and logistic regression.

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Revised March 2005