Head postures during naturalistic driving.

The objective of this study was to quantify the amplitude and duration of rotated head postures observed in drivers during naturalistic driving. METHODS: Twenty volunteers (14 males: 36 ± 12 years, 6 females: 27 ± 5 years) drove a 2010 Subaru Impreza on public roads while their 3D head angular position relative to the car was recorded using inertial measurement units. An experimenter rode in the passenger seat (right side) and logged when subjects performed one of six head movements: bilateral shoulder and side mirror checks, looking at the rear-view mirror and looking at the front seat passenger. Video of the subjects was used to confirm the logged head movements and identify movements that the experimenter missed. The duration and amplitude of all six head movements were tabulated and then compared between periods when the car was moving and when the car was stationary. RESULTS: During a 68 ± 5 min drive, subjects performed a median (range) of 15 (5-39) left shoulder checks, 82.5 (29-167) left mirror checks, 40.5 (10-168) rear-view mirror checks, 27.5 (3-113) right mirror checks, 60 (0-185) passenger-looks, and 12.5 (1-28) right shoulder checks. Peak yaw angles of the head relative to the vehicle for these six movements averaged -81.5°, -34.3°, 16.2°, 42.1°, 58.2°, 84.3° respectively. Drivers spent a larger proportion of time in non-neutral postures when the vehicle was stopped (17.5%) compared to moving (8.2%) (...
Source: Traffic Injury Prevention - Category: Accident Prevention Authors: Tags: Traffic Inj Prev Source Type: research

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