What assumptions are made when calculating carbon emissions?
When calculating carbon emissions for selected routes we try to provide an accurate comparison between car travel and existing public transport which can result in different distances between road and rail travel in the calculation. If you are interested in comparing transport modes over the same distances then the ‘specific mileage’ calculation method provides this information. As the occupancy of a car is increased, it’s carbon emission value decreases. This is due to the assumption that by increasing the number of occupants in the car you are saving on carbon by preventing those occupants from undertaking their own additional journeys. If you wish to view the actual carbon emissions from your vehicle regardless of occupancy then calculate CO2 emissions for 1 occupant. The carbon conversion factors for public transport are based upon the assumption that public transport operates regardless of whether you travel or not. Car journeys are in most cases an avoidable form of transport tha
