Bus systems provide a versatile form of public transportation with the flexibility to serve a variety of access needs and unlimited range of locations throughout a metropolitan area. Buses also travel on urban roadways, so infrastructure investments can be substantially lower than the capital costs required for rail systems. As a result, bus service can be implemented cost-effectively on many routes. Yet, despite the inherent advantages of a bus service, conventional urban buses inching their way through congested streets don’t win much political support. The essence of a Bus Rapid Transit is to improve bus operating speed and reliability on arterial streets by reducing or eliminating the various types of delay.

The bus system of Curitiba, Brazil, exemplifies a model Bus Rapid Transit (BRT) system, and plays a large part in making this a livable city. The buses run frequently — some as often as every 90 seconds — and reliably, and the stations are convenient, well-designed, comfortable, and attractive. Consequently, Curitiba has one of the most frequently used, yet low-cost, transit systems in the world. It offers many of the features of a subway system — vehicle movements unimpeded by traffic lights and congestion, fare collection prior to boarding, quick passenger loading and unloading — but it is above ground and visible. Around 70 percent of Curitiba’s commuters use BRT to travel to work, resulting in congestion-free streets and pollution free air for the 2.2 million inhabitants of greater Curitiba.

Internet: (adapted).

According to what is stated in the text, it can be deduced that

Bus Rapid Transit succeeded in improving bus speed and reliability by taking away the several causes of delay, once and for all.