The Wabash Heritage Trail in Happy Hollow Park in West Lafayette, Ind., put up signs throughout 4 miles of walking trails that tell people with disabilities the length of trail segments, as well as surface, tread width, elevation, grade and typical cross slope. In making the trails compliant with the Americans with Disabilities Act, the city used a computer program to identify trail data and also created signs that include QR codes that can be scanned using mobile devices to bring up a trail guide.

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