Bus Rapid Transit or BRT, can be a rather generic term applied to a variety of bus-based transportation systems. In some instances the 'Bus Rapid Transit' term is applied to bus services that have been improved or intensified through the introduction of enhanced infrastructure, such as bus lanes or corridors, the use of higher capacity vehicles operating a more intense service, or it may be applied, probably more correctly, to a bus-based system that bridges the quality and capacity gap between a normal municipal bus service and a Light Rail Transit (LRT) system. Bus Rapid Transit for the 21st Century examines the development of BRT, particularly in Britain and Ireland, and at the elements that should be incorporated in a BRT scheme fit for the 21st century.