Yulia
Based on the wide variety of colors used to sell automobiles, it is most likely that forklift operators would prefer a different forklift color if they had a choice. The color choice, however, is a management prerogative and should be based not on aesthetics but on high visibility. In an operation with a significant amount of pedestrian traffic, multiple forklift use, interaction with delivery vehicles, or any combination thereof, then safety and the use of a highly visible color should be a key issue.
Most yellows and oranges are highly visible. Red is not as reflective at night or in dim light and poses a problem for some color blind people.
Visibility is reduced when two tone or multiple paint schemes are utilized. In the normal forklift operating environment, the background consists of straight lines (horizontal and vertical). Additional colors tend to camoflauge the silhouette of the forklift causing it to blend into the straight line background. (Compare pictures with work environment backgrounds of solid colored forklifts and multiple colored forklifts.)
I think most forklift colors are determined by the forklift manufacturer's marketing department and have little to do with high visibility. I find the current Crown beige/black color appealing. I give it poor marks, however, for high visibility.
If color is a key component in your paper, you may want to research the following areas:
Google: PSYCHOLOGY OF COLOR
Google: COLOR VISIBILITY
Google: VEHICLE COLORS
Google: VEHICLE COLOR VISIBILITY
Google: HIGH VISIBILITY FORKLIFT COLORS
Google: COLOR BLIND
Google: COLOR BLINDNESS
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