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
Dally in the Alley the proud sponsor of Detroit's Dally in the Alley. Proceeds from the Dally events are used to support North Cass projects which improve the quality of life for people who live and work in the North Cass Community. The North Cass Community Union has used Dally proceeds to fund an environmental lawsuit against the City of Detroit trash incinerator, provide roaming security during nighttime hours and grant scholarships to enable neighborhood children to attend the Art Center Music School. These Artists have converged with a number of other primarily Detroit-based performers on the Dally in the Alley art festival in