Baldwin Street, in Dunedin, New Zealand is the world's steepest residential street, according to the Guinness World Records. It is located in the residential suburb of North East Valley, 3.5km northeast of Dunedin's central business district.
A short straight street a little under 350m long, Baldwin Street runs east from the valley of the Lindsay Creek up the side of Signal Hill towards Opoho, rising from 30m above sea level at its junction with North Road to 100m above sea level at the top, an average slope of slightly more than 1:5. Its lower reaches are only moderately steep, and the surface is asphalt, but the upper reaches of this cul-de-sac are far steeper, and surfaced in concrete for ease of maintenance (bitumen—in either chip seal or asphalt—would flow down the slope on a warm day) and for safety in Dunedin's frosty winters.
The 161.2m long top section climbs 47.2m vertically, an average gradient of 1:3.41. At its maximum, about 70m below the top, the slope of Baldwin Street is about 1:2.86 (19° or 35%). That is, for every 2.86 metres travelled horizontally, the elevation changes by 1 metre.