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The tram on tires technology, TVR, which approximates what we would call today for top-level bus service, has become famous for having known a number of setbacks early in its history, because of an overly quick startup in 2000:
insufficient testing and debugging
problems of rolling stock reliability and ergonomics of the cockpit.
Finally, the final commissioning was delayed a year because of these disappointments.
The official rate since September 2006 is a tram every 5 minutes, but in fact the service is very irregular.