Other regional road transport by Greenhouse Gas Protocol


Road vehicle emissions methodology. Calculates direct fossil and/or biogenic carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and carbon dioxide equivalent (CO2e) emissions associated with distance travelled or fuel consumed. Choices include vehicle type, fuel type and emissions standard. Regions other than the United Kingdom and United States.


This methodology represents greenhouse gas emissions associated with the road transport in regions other than the US and UK. The data and calculation methodology is based on those provided in the Greenhouse Gas Protocol worksheet GHG emissions from transport or mobile sources (version 2.2), published in June 2011.

The methodology

Emissions model

The emissions methodology is based upon emissions factors which describe the rate at which greenhouse gas emissions are produced during road-based travel in relation to distance travelled. These emissions factors represent emissions associated with entire vehicles (e.g. car, motorcycle), which can be contrasted with similar transport-related emissions factors which describe emissions on the basis of pssengers or freight. Emissions for individual passengers can nevertheless be derived by 'sharing' vehicular emissions across all vehicle occupants, if the occupancy of the vehicle is known.

Since the CO2 produced during the burning of biofuels in not a net contributor to atmospheric warming (see here), fossil- and biofuel-associated CO2 are explicitly defined.

Emissions - expressed in terms of mass (e.g. kg) - are calculated by multiplying these rates (mass emitted per distance; e.g. kg CO2 per mile) by a distance (e.g mile) travelled.

Model data

The rate at which road transportation produces greenhouse gas emissions varies with the type of vehicle, depending on factors such as the type of fuel used (e.g. gasoline/petrol, diesel), the fuel efficiency (i.e. the distance achieved per unit of fuel consumed) and the presence and type of emissions control technology employed. Therefore, emissions factors for a broad range of generalised road transport scenarios are provided.

A total of 75 specific types of road transport are represented and are differentiated by vehicle type (i.e. bus, car, light and heavy goods vehicles, motorcycles), fuel type (gasoline/petrol, diesel, ethanol, LNG, LPG) and emissions standard. In the case of car, and light and heavy goods vehicles, the emissions standard is represented by the year of production. For motorcycles, the emissions standard depends on the explicit type of technology employed (e.g. non-catalyst control).

Both fossil- and biogenic-CO2 emissions factors are provided although the latter is applicable only to those scenarios using representing the use of ethanol as fuel.

Activity data required

According to this methodology, greenhouse gas emissions are directly proportional to the distance travelled, which therefore must be specified in order to make an emissions calculation.

If multiple passengers are under consideration, this number can be specified, in which case vehicle emissions are shared amongst all passengers.

Calculation and result

The returned quantities for this methodology represent CO2, and biogenic CO2 emissions associated with the activity data (distance) specified. In most cases CO2 emissions are entirely represented by fossil CO2 as only biofuels (in this case, ethanol) or biofuel blends contain biogenic carbon.

Similar methodologies

Other Greenhouse Gas Protocol transport methodologies are available representing general transport fuel consumption, fuels consumed in specific transport contexts, freight transport, passenger/public transport, and road transportation in the UK (with heavy goods), and US.

ZLW4GFA95KKQ bus, diesel
6LH1M7OK52T7 bus, ethanol
X2WWWW5T64LH bus, gasoline
Z4NC6D8ACY66 heavy duty vehicle (articulated), diesel, 1960-present
OLGW0T66XDNM heavy duty vehicle (articulated), ethanol
JBEPDQGUKSVE heavy duty vehicle (articulated), gasoline, 1985-1986
FW8SUL1MH5ZF heavy duty vehicle (articulated), gasoline, 1987
4ZAMNZ38VL6X heavy duty vehicle (articulated), gasoline, 1988-1989
1L2IQTA4IARD heavy duty vehicle (articulated), gasoline, 1990-1995
CNWQA26WG5UO heavy duty vehicle (articulated), gasoline, 1996
AI4WF8HW6VHP heavy duty vehicle (articulated), gasoline, 1997
ZEEOE5SPQ4K3 heavy duty vehicle (articulated), gasoline, 1998
4PML74MOD6AA heavy duty vehicle (articulated), gasoline, 1999
B1BE95XGV6QK heavy duty vehicle (articulated), gasoline, 2000
UE7DHCG6O2ED heavy duty vehicle (articulated), gasoline, 2001
DSPTHNZ1W9EB heavy duty vehicle (articulated), gasoline, 2002
2FAIOOQ6XEBK heavy duty vehicle (articulated), gasoline, 2003
07ZNLQUJNEZJ heavy duty vehicle (articulated), gasoline, 2004
2JKPIRSWOBV1 heavy duty vehicle (articulated), gasoline, 2005-present
NTW87TH1AXT1 heavy duty vehicle (articulated), lng
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