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School Bus Colors
The color of vehicles you don't want cars running into is a serious issue in ergonomics. Do you keep the accustomed colors (fire-truck red and school-bus orange are "display stereotypes", or do you paint them fluorescent lime-green (the highest conspicuity color for most conditions)? (White is better at night -- unless there's snow -- assuming that for some reason there are no marker or other lights on, or reflectors.)
The general practice is a gradual switch of emergency vehicles to the green while schoolbuses stay orange. Since their roofs are not seen, they can be colored white (or black in the arctic) to help temp control.
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School Bus Colors
Earth: Surprised about the scowl. Maybe just jealous of your truck. Or wondering if you were going to be working with it. Flashing yellow marker roof lights are permitted in Canada but red is restricted to authorized emergency vehicles and blue to snowplows.
Hard: You heard right but it's complex. Our night-vision retinal photoreceptors (rod-shaped under a microscope) are least sensitive to the red end of the color spectrum, most sensitive to the blue end. (They don't perceive any specific colors as such and would perceive blue as grey.) But if your headlights are on the road, there'd be too much light for dark adaption, meaning you aren't using your rods but your day-vision cells or cones, which are most sensitive to yellow-green. But those relative sensitivities assume equal intensity, and there isn't. When dark adapted you'd see blue best. But puting a blue cover over a white light reduces the intensity so much that you'd see the uncovered white better. (Based on an early and partial understanding of the eye, airport night runway markers are blue. But now they're considered another "display stereotype" because they'd be better seen if left white.)
Yes, when fully dark adapted, a maroon object would be invisible. Although blue is easiest seen at night, if you had a red and a blue truck, which would you see better? Well, blue has low intensity, and red can be quite bright or intense (and more reflective), so it would be a washout.
These misunderstandings are common. Some vehicles have instrument displays that are red, for better night vision. If you were that dark-adapted you couldn't read them, as rods don't perceive form but only motion. (The best is yellow-green, set at minimum reading intensity.)
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