Specification of control illumination limits.

Author(s)
Langolf, G.D. Mourant, R.R. & Fisher, J.
Year
Abstract

This project was instituted to determine minimum and maximum limits of vehicle control label illumination and to recommend procedures for compliance testing. In order to establish a minimum brightness levels, a psychophysical procedure was used to establish the 95% correctness threshold for 95% of older drivers. Results showed that minimum brightness levels must be specified as a function of a letter size and contrast ratio. Older drivers required almost 10 times more light than younger drivers.

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Publication

Library number
B 11847 /83.2/91/ IRRD 221951
Source

Detroit, Wayne State University, 1974, 76 p., fig., graph., tab., 23 ref.; DOT HS-801 260 / NTIS PB-237549.

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