A sneckdown or snowy neckdown is effectively a curb extension caused by snowfall. A natural form of traffic calming, sneckdowns show where a street can potentially be narrowed to slow motor vehicle speeds and shorten pedestrian crossing distances. Coined by Streetsblog Founder Aaron Naparstek, popularized by Streetfilms Director Clarence Eckerson, Jr. and spread widely via social media, the term first appeared on Twitter on January 2, 2014 at 11:19pm EST. Other Twitter hashtags that have been used to describe snow-based traffic-calming measures include #plowza #slushdown #snovered and #snowspace.
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Philadelphia, Pennsylvania - Baltimore and 48th Street, 2011: A sneckdown inspired permanent upgrades to the pedestrian environment at this intersection.
In the 1980s, some planners in Australia distributed cake flour in intersections to observe patterns of vehicle movement hours later.