Canton Avenue is a street in Pittsburgh's Beechview neighborhood which is the steepest officially recorded public street in the United States. Canton Avenue is 630 ft long (the hill is about 213 feet long) and is claimed to include a 37% grade 21 ft long. The Guinness Book of World Records says Baldwin Street, in Dunedin, New Zealand, is the world's steepest street with a gradient of 34.8%. This record is disputed; Pittsburgh news and international media have claimed Canton Avenue is the steepest street in the world. The United States record is also disputed, as Bradford Street in San Francisco includes a 39% grade nine meters long and Waipio Valley Road has sections as steep as a 45% grade. In March 2016 Canton Avenue was the subject of a commercial, featuring freeskier Bene Mayr, snowboarder Heikki Sorsa, downhill mountain biker Aaron Gwin, and racing driver Mattias Ekström for the Audi Quattro A4 automobile.