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
Give Us a Clue and the show introduced a lateral thinking puzzle (which the host could "give clues to"). "Give us a Clue" returned for a special Comic Relief episode in March 2011 with Sara Cox, Christopher Biggins, Lionel Blair, Una Stubbs, Holly Walsh, Jenni Falconer and David Walliams. The game was based on charades, a party game where players used mime rather than speaking to demonstrate a name, phrase, book, play, film or TV programme. Each player was given roughly two minutes to act out their given subject in front of his/her team, and if the others were unsuccessful in guessing correctly, the