Skywalk

Pedestrians, street vendors, scooters and squatters all compete for space on the gridlocked sidewalks of Mumbai, where nearly 60% of the population travels by foot. Solution? 50 elevated walkways, or "skywalks."
Feb 2, 2010   TheCityFix.com
<p>This segment from <em>NPR</em> looks at what's happened since a Native American tribe in Arizona opened a glass-floored walkway extending over the Grand Canyon.</p>
Apr 25, 2008   NPR