Predicting driver distraction using computed occlusion task times : estimation of task element times and distributions.

Details

• Creators:
  Elwart, Tessa ; Green, Paul ; Lin, Brian
• Corporate Creators:
  University of Michigan. Transportation Research Institute
• Corporate Contributors:
  United States. Dept. of Transportation. Office of the Assistant Secretary for Research and Technology
• Subject/TRT Terms:
  • Driver distraction
  • Task analysis
  • Vision tests
  • Eye movements
  • Human factors
  • Driver vehicle interfaces
  • Age
• Publication/ Report Number:
  ATLAS-2015-01 ; UMTRI-2015-8
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Center for Advancing Transportation Leadership and Safety (ATLAS Center)
• Abstract:
  To determine conformance with NHTSA’s visual-manual interface distraction guidelines and to ; reduce the associated number of crashes, NHTSA recommends a visual-occlusion test ; procedure. As an alternative to testing subjects following that procedure, this report provides ; experimentally based estimated times for in-vehicle task elements (e.g., flick, press button). ; Those estimated times can be summed and then adjusted using Pettitt’s method (which assumes ; that visual tasks progress only when the test goggles are open) to estimate total task occlusion ; time. The estimated times were determined from a frame-by-frame analysis of data from an ; occlusion experiment evaluating a next-generation Hyundai navigation radio. ; That analysis revealed the mean element time for middle-aged subjects (45-55) was only about ; 16% longer than young (25-35) subjects, whereas the mean task time was 44% greater, ; primarily because there were 32% more occurrences of elements to complete tasks. ; The elements and their mean times were flick (0.50 s), flick/scroll return (0.38 s), press button ; (0.64 s), quick flick (0.35 s), reach for button (0.42 s), reach for center console (0.75 s), read ; instructions (0.53 s), scroll (0.66 s), search (0.54 s), stop screen (0.24 s), turn knob (0.43 s), ; reposition hand on knob (0.33 s), wait-loading (0.90 s), wait after loading (0.92 s), wait for ; goggles-known location (1.34 s), and wait for goggles-unknown location (0.92 s). Most element ; distributions were lognormal. Interestingly, 45% of all element occurrences were when the ; goggles were closed or in open-closed or closed-open periods. Given this, the assumptions of ; Pettitt’s method need further thought.
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• Format:
  PDF
• Funding:
  DTRT13-G-UTC54
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28840/dot_28840_DS1.pdf
• File Type:
  [PDF - 3.01 MB]
• Collection(s):
  University Transportation Centers ; US Transportation Collection
• Main Document Checksum:
  urn:sha256:6e2333f448c03f0b4a48ce57cae05a0c5ce03fc350d9dea224031748dbbb69b6