Alexander Dennis Enviro500

The Alexander Dennis Enviro500 (previously known as the TransBus Enviro500) is a tri-axle double-decker bus built by Alexander Dennis (formerly by TransBus) in the United Kingdom. It was unveiled in 2002 and is one of the Enviro-series bus models made by TransBus/Alexander Dennis.

In August 2008, First Glasgow ordered a batch of 25 to add to its existing 3-axle Volvo B7L/East Lancs Nordics. They were put into service between April and June 2009.