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Aspherical Convex Mirrors Improve Operator Judgement in Heavy Commercial Vehicles
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Abstract
Spherical convex auxiliary mirrors are commonly used on commercial vehicles to expand the field of view (FOV) beyond the limited FOV (approximately 10 degrees lefl and 4 degrees right) available in flat mirrors commonly referred to as “West Coast Mirrors”.
Unfortunately the tradeoff with the short radius spherical convex mirrors used to obtain the desired FOV is a dramatic reduction (95% or greater) in apparent image size. This much reduced image size provides the vehicle operator with information sufficient to detect the presence or absence of adjacent vehicles, but is of limited use in making the relative speed and relative distance judgements required for lane changes.
Considerable efforts are being expended to develop relatively high cost electronics based object detection and warning systems. However, vehicle operators at a relatively b w cost, can obtain the larger image sizes and much of the information needed for good driving judgements through the use of multi radiused aspherical mirrors. Such mirrors can better manage the required design tradeoffs between:
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Large image size with good distance judgement, and
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An extended wide angle FOV that substantially reduces the side blind spots.
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Citation
McIntyre, A., McCord, R., and Dalby, G., "Aspherical Convex Mirrors Improve Operator Judgement in Heavy Commercial Vehicles," SAE Technical Paper 952654, 1995, https://doi.org/10.4271/952654.Also In
References
- Piihail. Stig Voivo Car Corp. “Improved Rearward View” SAE 810759
- FMVSS 111 § 7 and 8
- FMVSS 111 § 5.3 and 10
- FMVSS 111 § 5.4.1
- National Highway Transportation Safety Administration “A Study of Commercial Vehicle Electronics-Based Rear and Side Object Detection Systems” Pub. No. DOT 808 075 January 1994
- McCord, Robert C. Multivex Mirror Company “Rearview Mirror” April 28 1981
- McCord, Robert C. MultiVex Mirror Company “Rearview Mirror” May 22 1984
- FMVSS 111 § 5.4.3
- Garrott, W.R. Rockwell, T.H. Kiger, S.M. National Highway Transportation Safety Administration “Ergonomic Research on School Bus Cross View Mirror Systems” Pub. No. DOT HS 807 676 August 1990