neckdown
n.— «At their best, Greenstreets—the pint-sized green spaces that Parks began planting in 1996—have served as modest traffic-calming measures, displacing asphalt with patches of greenery that send cues to slow down. The new breed goes a few steps further: They combine advanced stormwater capture techniques with more overt traffic-calming devices, like neckdowns and bulb-outs.» —“http://www.streetsblog.org/2008/02/14/greenstreets-of-new-york-new-and-improved/” by Ben Fried, Daniel Simon Streetsblog (New York City) Feb. 14, 2008. (source: Double-Tongued Dictionary)