132 Ergonomics in the Automotive Design Process
3. Signal effectiveness:
a. Signal visibility and conspicuity: A signal lamp should be visible under all driving
environments (daytime and with sunlight falling on the stop and turn signal lenses,
dawn/dusk, night, rain, fog, etc.).
b. The signal should be recognizable and interpretable with minimal confusion.
c. The driver’s response time to detect, recognize, and correctly interpret a given trafc
situation indicated by vehicle signal lamps should be as short as possible (about 1 s).
d. A signal lamp should not degrade a driver’s ability to see and interpret other visual
details or signals (e.g., masking of other signals, glare due to signal lamps, etc.).
4. Signal coding methods: ...