Construction Equipment Is Yellow, And Here Is Why
Despite having different functionalities, all construction equipment out there has one thing in common – their yellow color.
Have you ever wondered why this is so? Why do they all share the same color, and why yellow in particular? Let’s find out together.
Yellow helps with visibility.
Yellow is the most visible color on the light spectrum. This color is bright and noticeable, even when looking from a distance and in the dark. Yellow is also easily distinguishable from other standard colors on construction sites, i.e., the color of dust, the ground, and outfits.
Yellow represents safety.
Yellow is also adopted as an effective warning color because it is easy to see, even when the conditions are unusual. Everyone, including pedestrians and workers, can quickly spot construction equipment and avoid them when painted yellow. This helps to keep everyone near and on construction sites safe.
Yellow helps with awareness.
As a high-energy color, yellow also helps improve mental stimulation. This ensures machine operators and construction workers work with optimal awareness and energy levels at all times. Therefore, there is improved productivity and safety in and around the site.
Yellow is the culture.
Yellow has been in use for decades on construction sites. It has been around for so long that almost everyone involuntarily associates the color yellow with construction.
Why is yellow that visible?
When light moves, it does so in waves of various lengths and frequencies. The color we see with our eyes depends on the particular frequency and length the light wave is traveling at. However, the human eye can only pick up light at certain wavelengths (measured in nanometers – nm)—the visible color spectrum. This spectrum comprises seven colors: red, orange, yellow, green, blue, indigo, and violet. The wavelength range is between 380 nanometers (violet) and 700 nanometers (red). The wavelength of yellow light is between 570 and 590 nanometers, which means it is highly visible.
The eyes rely on their photoreceptor cells—the cones. Cones detect the wavelength of colors and relay the message to the brain. The eyes find it easier to sense some of these wavelengths than others. For example, green is more challenging for the eyes to spot during the day, while yellow is easier.
Rods are another group of photoreceptor cells in the human eye. They become active when there is insufficient light, picking up the role of cones. Rods find it easiest to sense yellow, even at a considerable distance.
Yellow is therefore chosen as the ideal color for construction equipment for these reasons. It is easily detectable by the human eyes, even in challenging site conditions like snow, fog, haze, and clouds.
How did the yellow CAT machines come by?
Battleship gray was the primary color associated with CAT construction equipment in the early 1900s. The switch to yellow, or Hi-Way Yellow, happened in 1931.
The change was informed by the need to improve the visibility on road construction sites. The people at the helm of affairs preferred a color that served visibility and aesthetic purposes during the night and day. Yellow was eventually picked, and the paint specialists at Caterpillar refined it into the unique Hi-Way Yellow shade. The Hi-Yellow color is a shade of yellow with more brightness and boldness, making it more visible and attention-grabbing. The company also switched from the red trim to the black trim in 1931 and has maintained that to date.
The Hi-Way Yellow made way for Caterpillar Yellow in 1979. The current yellow is the legally protected paint for Cat parts and machines. Unlike the Hi-Way Yellow, the Caterpillar Yellow is more appealing without losing its visibility.
Caterpillar is committed to improving its formula to ensure the equipment color guarantees maximum longevity and durability. However, it has maintained the specific yellow hue to date. The Caterpillar Yellow and black mix have been adopted as the brand’s official colors, which you find in all Cat equipment. The color shade has also been integrated into the modern Cat logo adopted in 1989.