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School Bus Colors
I never really got to looking at a combine--how fast will they go?
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School Bus Colors
Late model combiles will go about 18-20 MPH on the road, the older ones like the demo derby types went about 14-15 tops.
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School Bus Colors
While I'm certainly NOT a school bus driver, although my pickup is nearly the same size.
I can say that after flying over many a school bus (around southern Ontario anyways) there is no numbers on top, but many of them are in fact white now.
The police cars do have numbers on their roofs up here though, which makes reporting bad drivers a BUNCH easier. With a bit of practice it's really easy to guide them directly to the driver in question.
I have noticed though that quite a few of them have a revolving ventilator mechanism on the roof at the very rear, sort of like the 'whirly-bird' house attic vents. They supposedly draw the cool (air conditioned I suppose) air from the front to the back and outside.
Best of luck.
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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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11-17-2008, 07:07 
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