I know that UPS trucks always try to avoid left turns cause that delays them ever so slightly.
How does the font matter? Speed of understanding the message?
Ease of reading. Even the color contrasts matter, between background and font colors.
Do you know why UPS avoids left hand turns? They made them up until about 1998 or 1999. (The answer is, "Me. Me. I'm why they don't take left turns.")
It makes me happy to be able to say that I've truly influenced the world. I've changed the way things get done. It was a very rewarding career.
It has changed a great deal, just in the past 14 or so years. It's a moving target, a constantly improving art. I kinda miss the challenges it posed. There was always something for me to puzzle over, sometimes for months, while trying to figure out how to describe it with math.
I think ups trucks take lefts at roundabouts, don't they?
And white lettering on green signs is best?
A roundabout is a right into it and a right out of it (with few exceptions).
The green is kinda down to history (and not used everywhere) from when WWII ended and we had a shitton of green paint and a shitton of white paint, all government surplus. Government surplus meant the different departments (or states, or anyone really) could get a bunch of it for very little money. So, they used green paint and white letters. The green was a very different green back then.
Today, it's a very special paint that makes the light reflect in very specific ways. Seriously, it's like $400 for a gallon of the paint and only a couple of companies manufacture it. The green will be dark at certain angles and show the white lettering more clearly.
They tried changing the font but it has been restored for the national highway system. States and cities/towns may have their own standards and colors. The two most used in the US are Highway Gothic and Clearview.
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