sneckdown

thumb|A sneckdown on a corner in Allston, Massachusetts, United States thumb|Sneckdown showing a triangle of less used road space on a T-intersection in [[Sofia, Bulgaria]]

A sneckdown (or snowy neckdown) is a buildup of snow on a road that has not been flattened and cleared by traffic, particularly at an intersection. Because it marks where traffic does not go, a sneckdown may reveal where traffic calming measures such as curb extensions or narrower lanes might be safely implemented.