Browsing by Author "Viita, Derek"

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    Feasibility of Using In-Vehicle Video Data to Explore How to Modify Driver Behavior That Causes Nonrecurring Congestion: SHRP 2
    Rakha, Hesham A.; Du, Jianhe; Park, Sangjun; Guo, Feng; Doerzaph, Zachary R.; Viita, Derek; Golembiewski, Gary A.; Katz, Bryan J.; Kehoe, Nicholas; Rigdon, H. (National Research Council (U.S.). Transportation Research Board, 2011)
    Nonrecurring congestion is traffic congestion due to nonrecurring causes, such as crashes, disabled vehicles, work zones, adverse weather events, and planned special events. According to data from the Federal Highway Administration (FHWA), approximately half of all congestion is caused by temporary disruptions that remove part of the roadway from use, or "nonrecurring" congestion. These nonrecurring events dramatically reduce the available capacity and reliability of the entire transportation system. The objective of this project is to determine the feasibility of using in-vehicle video data to make inferences about driver behavior that would allow investigation of the relationship between observable driver behavior and nonrecurring congestion to improve travel time reliability. The data processing flow proposed in this report can be summarized as (1) collect data, (2) identify driver behavior, (3) identify correctable driver behavior, and (4) model travel time reliability, as shown in Figure ES.1.
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    Radio Tuning Effects on Visual and Driving Performance Measures: Simulator and Test Track Studies
    Perez, Miguel A.; Owens, Justin M.; Viita, Derek; Angell, Linda; Ranney, Thomas A.; Baldwin, G. H. Scott; Parmer, E.; Martin, John; Garrott, W. Riley; Mazzae, Elizabeth N. (United States. National Highway Traffic Safety Administration, 2013-05)
    Existing driver distraction guidelines for visual-manual device interface operation specify traditional manual radio tuning as a reference task. This project evaluated the radio tuning reference task through two activities. The first activity consisted of a static evaluation of the features and layouts of 12 original equipment vehicle radios. The second activity consisted of an experiment in which naÏve participants drove five models of vehicles on a test track while performing manual radio tuning tasks. Driving performance measures and eye glance behavior were examined during radio tuning and baseline (no secondary task) periods. Results showed differences between task and baseline periods in most measures as a function of radio design. Results of the test track radio running experiment were evaluated along with experimental data for radio tuning obtained in a driving simulator by NHTSA. Similar results were found for most eye glance measures. The data suggest the following visual demand acceptability criteria based upon driver 85th percentile radio tuning performance: - Individual eye glances away from the forward road scene should not exceed 1.3 seconds, and - Total eyes-off-road time to perform an entire task should not exceed 12.1 seconds. For compatibility with occlusion testing, these time values should be rounded off to multiples of 2.0 seconds. This gives task acceptability criteria of individual eye glances away from the forward road scene not exceeding 2.0 seconds and total eyes-off-road time to perform an entire task not exceeding 12.0 seconds.