National Recreation Trails 2004 Photo Contest/esandy-576.jpg

The Allegheny River National Recreation Trail in Pennsylvania. The Kennerdell and Rockland Tunnels are long and curved. They're also far, far from electricity. Furthermore, they're paved in the center with black cinders on the sides. The developers found a clever way to handle this: they put down 4" highway reflectors on the center and sides of the pavement. Any light at all, even a feeble headlight, gives a lot of light back to the rider (photo by Mary Shaw; all rights reserved).

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