page_title: Alexander Dennis Enviro500
section_title: First generation (2002–2014)
hierarchical_section_title: Alexander Dennis Enviro500 / First generation (2002–2014)
caption_attribution_description: 九巴一輛Trident E500巴士行走102路線，由zh:User:Wrightbus拍攝。 A KMB Enviro 500 double-decker running on route 102. Photo taken by zh:User:Wrightbus.
context_page_description: The Alexander Dennis Enviro500 is a three-axle double-decker bus built by Alexander Dennis in the United Kingdom. It was unveiled in 2002 and is one of the Enviro-series bus models made by TransBus/Alexander Dennis.
  The second generation Enviro500, also known as the Enviro500 MMC or Enviro500 USA Standard, was launched in 2012, replacing the original version.
context_section_description: The Dennis chassis for Enviro500 (also known as Trident E500) was modified from the Trident 3. It can be fitted with Cummins ISMe335 Euro III engine (later Cummins ISLe340 Euro IV/Euro V engine which uses AdBlue to reduce emission of nitrogen oxides through selective catalytic reduction process), or ISM-330 engine for the buses delivered to North America, and coupled to Voith DIWA864.3E 4-speed or ZF 5HP602 5-speed gearbox. Later Voith DIWA864.5 4-speed gearbox, ZF 6HP602 6-speed gearbox and Allison B500R 6-speed gearbox became available and gradually became the standard configurations.
  Initially only the 12-metre long (39 ft 4 ¹⁄₂ in) version of the Enviro500 was built, but in 2007 Alexander Dennis announced the production of the 12.8-metre long (41 ft 11 ⁷⁄₈ in) version, and an 11.3-metre-long variant followed in 2008.
  Later Alexander Dennis developed the hybrid electric version of Enviro500, known as the Enviro500H, with Allison's parallel hybrid drive system; it was unveiled in late 2008.
  The body of the Enviro500 was based on the original style of the single-deck Enviro300, and the upper-deck frontal design was similar to the design used on the Plaxton President body.
caption: Kowloon Motor Bus Enviro500 with Mk1 bodywork in Hong Kong in October 2005
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