Life in the street has an impact on safety, but life along the street also plays a significant role. Urban areas with mixed functions provide more activities in and near buildings around the clock. Housing in particular signifies good connections to the city’s important common space and a marked reinforcement of the real and perceived safety in the evening and at night. So even if the street is deserted, lights from windows in residential areas send a comforting signal that people are nearby. Approximately 7,000 residents live in Copenhagen’s city center. On an ordinary weekday evening in the winter season a person walking through the city can enjoy the lights from about 7,000 windows.25 The proximity to housing and residents plays a key role in the feeling of safety. It is common practice for city planners to mix functions and housing as a crime prevention strategy and thus increase the feeling of safety along the most important streets used by pedestrians and bicyclists. The strategy works well in Copenhagen, where the city center has buildings between five and six stories high, and there is good visual contact between residences and street space. The strategy does not work as well in Sydney. Although the Australian metropolis has 15,000 people living in its heart, the residences are generally from 10 to 50 stories above street level, no one who lives high up can see what is happening down on the street.