Rowdy crowds cause broadly two types of problems at night in the city centre:
1. They create noise which is a problem if they are near residential premises or other noise sensitive locations such as the hospital
2. They can, often without intending to. intimidate other users of the city centre.
Crowd tend to form:
-Outside pubs and clubs because they cannot smoke inside
-Outside pubs and clubs because they are just loitering prior to going home
-Outside pubs and clubs because they have been ejected or refused entry
-Outside fast food outlets
-In queues for buses and taxis
Sometime crowds are just wandering the streets with no real aim.
Crowds are particularly a concern because they are often the breeding ground for fighting and threats of violence