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Sneckdown on a T-intersection in Sofia

A sneckdown[1] or snowy neckdown[2] 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,[3] popularized by Streetfilms director Clarence Eckerson, Jr. and spread widely via social media,[4] the term first appeared on Twitter on January 2, 2014 at 11:19pm EST.[5] Other Twitter hashtags that have been used to describe snow-based traffic-calming measures include #plowza, #slushdown, #snovered and #snowspace.


  • Shortens pedestrian crossing time
  • Highlights unused road space
  • Calms vehicle traffic
  • Allows planners and road engineers to clearly see possible modifications to road structures
  • Encourages slower vehicle speeds, increasing safety for all road users, including pedestrians
  • Reduce asphalt surfaces, increase plant surfaces, improve the absorption of rainwater by the soil, reduce runoff and floods


Philadelphia, Pennsylvania – Baltimore and 48th Street: A sneckdown inspired permanent upgrades to the pedestrian environment at this intersection in 2011.[6]

In the 1980s, some planners in Australia distributed cake flour in intersections to observe patterns of vehicle movement hours later.[7]


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