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A sneckdown (or snowy neckdown) is a temporary curb extension caused by snowfall, where snow has built up in the road but not been flattened by traffic, effectively reshaping the curb. Sneckdowns show how the space is being used by vehicle and foot traffic, and may reveal points where a street could be usefully narrowed with to slow motor vehicle speeds and shorten pedestrian crossing distances.
The practice of using snow to trace the behavior of vehicles, pedestrians, and playing children was already described in Camillo Sitte's 1901 urban design treatise.
In the 1980s, some planners in Australia distributed cake flour in intersections to observe patterns of vehicle movement hours later.
In Philadelphia, Pennsylvania, at Baltimore and 48th Street, a sneckdown-inspired permanent upgrade to the pedestrian environment was made in 2011.
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