Arc (geometry), a segment of a differentiable curve
I recall as a younger person walking over this train bridge, what was I thinking. Below it is the Snake River, fast, deep and unyeilding. The flooring looks solid but don't be fooled, the boards are acutally about 2 feet apart, just enough room to fall through. I have seen in my travels many families that love to stand in the middle of the bridge to have ther picture taken. WHY? This is just so not for me as I have hights.