Naturalistic Driving Study: Alcohol Sensor Performance (2015) / Chapter Skim
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5Research Approach The present research study built on the pilot investigation and Phase 1. Those earlier exploratory efforts established a framework for understanding the nature of the alcohol sensor, provided significant insight into the necessary direction for Phase 2, and demonstrated several research needs.
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6to determine if the sensor was accurately capturing data and to aid in developing an algorithm. Since the purpose of the sensor was to detect imbibed alcohol, ideally a study could have been conducted in which drivers with different levels of blood alcohol content (BAC)
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7 were collected and stored at a rate of 10 Hz, the same rate used by the alcohol sensor in the SHRP 2 study. Experimental Procedure Experimental tests were performed on a predetermined study route that included several types of roadways and speeds ranging from 25 mph to 65 mph and that lasted approximately 15 minutes.
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8output, and a trip did not start until multiple consecutive readings were within approximately 0.04 g/dL. Readings on Boozooka BrAC were taken at least every 5 minutes of the trip using the Lifeloc FC20 breath alcohol testers.
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9 intoxication. Camera views captured the forward roadway, rear view, driver's face, and driver's hands.
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10 Batch 1: Late Night and Alcohol Sensor Positive Trips n = 562 Batch 2: Randomly Selected Control Trips n = 97 Complete Data Set n = 659 Moderately Impaired Trips n = 91 Control Trips n = 97 Trip Batches Impaired Data Set Naturalistic Test Data Set Figure 2.3. Distribution of trip files into relevant analysis databases.
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