Articulated buses have been introduced on several major, high-capacity routes in the 2000s, coinciding with and was possibly prompted by the final withdrawal from passenger service of the iconic Routemaster bus from the streets. Routemasters were not accessible to the disabled, and hard to use by elderly; thus they fell foul of the Disability Discrimination Act. There was also the risk of litigation over accidents involving the Routemaster's rear open platform. However, Routemasters had been refurbished with new engines which could do 8mpg, where the much heavier bendy-buses can only do 5.5mpg.