"The National Telecommunications and Information Administration (NTIA) is responsible for managing the Federal Government's use of the radio spectrum. In discharging this responsibility, NTIA uses the ITS radio spectrum measurement system and portable measurement systems to collect data for spectrum utilization assessments. This report details an NTIA project to measure and analyze land mobile radio channel usage statistics in the metropolitan area of Atlanta, Georgia, before, during, and after the 1996 Summer Olympic Games. [...] In summary, the results of the 1996 Summer Olympic Games channel usage measurements indicate that, in the event of natural or man-made public emergencies, a land mobile radio spectrum capacity capable of accommodating two to three times ordinary channel usage levels may be required to meet emergency needs."
NTIA Report 98-357
Institute for Telecommunication Sciences: http://www.its.bldrdoc.gov/