This snapshot, taken on
, shows web content acquired for preservation by The National Archives. External links, forms and search may not work in archived websites and contact details are likely to be out of date.
The UK Government Web Archive does not use cookies but some may be left in your browser from archived websites.

What is a Low Carbon Emission Bus?

A low carbon emission bus (LCEB) is a bus that is able to achieve the LCEB target for Greenhouse Gas (GHG) emissions, which is equivalent to a 30% reduction in its GHG emissions compared to the average Euro 3 diesel bus of the same total passenger capacity. A low carbon emission bus can use any technology or fuel.

The definition of a LCEB was developed by LowCVP members and is based upon the GHG emissions from the vehicle and from the fuel production. The definition of a LCEB is as follows:

"A Low Carbon Bus produces at least 30% fewer Greenhouse Gas Emissions than the average Euro 3 equivalent diesel bus of the same total passenger capacity. The Greenhouse Gas (GHG) emissions will be expressed in grams of carbon dioxide equivalent measured over a standard test, and will cover "Well-to-Wheel" (WTW) performance, thereby taking into account both the production of the fuel and its consumption on board".

The LCEB emission target is expressed as a function of total passenger capacity and is expressed as:

GHG (g/km) = 6.28 x total number of passengers + 502

Low Carbon Bus Target

The Greenhouse Gases (GHG) of interest are Carbon Dioxide (CO2) Methane (CH4) and Nitrous Oxide (N2O). The relative "global warming potentials" for these 3 gases are 1:21:310 respectively. These emissions will be expressed in CO2 equivalent using the global warming potential to weight the emissions of each gas.

To qualify as a LCEB the bus must achieve the LCEB GHG target against a real life bus drive cycle such as the MLTB test cycle, or equivalent. If another test cycle is used this must be approved by the DfT in advance.

A vehicle can not qualify as a LCEB simply by using a fuel type which allows it to achieve a 30% reduction in its GHGs, unless the fuel it uses is biomethane.


Low Carbon Emission Buses Currently On The Road