Alley may be paved, or unpaved, and a blind alley is a cul-de-sac. Modern urban developments may also provide a service road to allow for waste collection, or rear access for fire engines and parking. Because of geography, steps (stairs) are the predominant form of alley in hilly cities and towns. This includes Quebec City in Canada and in the United States Pittsburgh (see Steps of Pittsburgh), Cincinnati (see Steps of Cincinnati), Minneapolis, Seattle, and San Francisco as well as Hong Kong, Genoa and Rome. Some alleys are roofed because they are within buildings, such as the traboules of Lyon, or
The blind leading the blind The blind leading the blind "The blind leading the blind" is an idiom and a metaphor in the form of a parallel phrase, it is used to describe a situation where a person who knows nothing is getting advice and help from another person who knows almost nothing. It can be traced back to the Upanishads, which were written between 800 BCE and 200 BCE. A similar metaphor exists in the Buddhist Pali Canon, composed in North India, and preserved orally until it was committed to writing during the Fourth Buddhist Council in Sri Lanka in 29 BCE. The expression