Modest visual impairments and headlamp glare reduce pedestrian visability at night
Wood, Joanne M., Tyrrell, Richard A. , Chaparro, Alex, Marszalek, Ralph P., Carberry, Trent P., & Chu, Byoung Sun (2010) Modest visual impairments and headlamp glare reduce pedestrian visability at night. In Transportation Research Board 89th Annual Meeting 2010 (CD-ROM), Transportation Research Board, Washington, DC, USA .
Background: This study investigated the effects of experimentally induced visual impairment, headlamp glare and clothing on pedestrian visibility. Methods: 28 young adults (M=27.6±4.7 yrs) drove around a closed road circuit at night while pedestrians walked in place at the roadside. Pedestrians wore either black clothing, black clothing with a rectangular vest consisting of 1325 cm2 of retroreflective tape, or the same amount of tape positioned on the extremities in a configuration that conveyed biological motion (“biomotion”). Visual impairment was induced by goggles containing either blurring lenses, simulated cataracts, or clear lenses; visual acuity for the cataract and blurred lens conditions was matched. Drivers pressed a response pad when they first recognized that a pedestrian was present. Sixteen participants drove around the circuit in the presence of headlamp glare while twelve drove without glare. Results: Visual impairment, headlamp glare and pedestrian clothing all significantly affected drivers’ ability to recognize pedestrians (p<0.05). The simulated cataracts were more disruptive than blur, even though acuity was matched across the two manipulations. Pedestrians were recognized more often and at longer distances when they wore “biomotion” clothing than either the vest or black clothing, even in the presence of visual impairment and glare. Conclusions: Drivers’ ability to see and respond to pedestrians at night is degraded by modest visual impairments even when vision meets driver licensing requirements; glare further exacerbates these effects. Clothing that includes retroreflective tape in a biological motion configuration is relatively robust to visual impairment and glare.
Impact and interest:
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|Item Type:||Conference Paper|
|Keywords:||Darkness, Glare, Night visibility, Night vision, Pedestrain safety, Protective clothing, Retroreflectivity, Vision disorders, Visually impaired persons|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright 2010 please consult the authors|
|Deposited On:||01 Feb 2011 11:34|
|Last Modified:||12 Jun 2013 23:51|
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