In 2006 and 2007, OC Transpo evaluated a double-decker bus on the Transitway and express routes. This bus, an Alexander Dennis Enviro500, can carry nearly 100 passengers. The initial service demonstration ran from June 28 to July 12, 2006, with a further demonstration under winter conditions in February 2007. The City of Ottawa purchased three Alexander Dennis Enviro500 buses and they were delivered in November 2008. OC Transpo decals were added to the buses in December, but the delayed the introduction of these buses. The buses started service in February.