This table is from a report produced by the Commission for Integrated Transport in 2005. The figures give maximum system capacity (passengers per hour per direction). It suggests that when there are more than about 3,000 passengers per hour - say around 40 buses - it is time to start thinking about replacing them with trams. Standard bus 2,500-4,000 Busway 4,000-6,000 Guided bus 4,000-6,000 Tram/Light rail 12,000-18,000 Heavy rail 10,000-30,000 Link to full report
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