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bilby commented on the word negative superelevation
"Roundabouts are typically built using what's called negative superelevation, meaning that water flows away from the center and also that the road slopes against the direction of a driver's turn. As a result, any crashes in a roundabout take place at lower speeds and are thus less likely to be fatal."
- Tom Vanderbilt, Don't Be So Square, slate.com, 20 July 2009.
July 21, 2009