The fundamental methodologies for estimating greenhouse gas emissions from road vehicles, which are presented in Section 22.214.171.124, have not changed since the publication of the 1996 IPCC Guidelines and the GPG2000, except that, as discussed in Section 126.96.36.199, the emission factors now assume full oxidation of the fuel. This is for consistency with the Stationary Combustion Chapter in this Volume. The method for estimating CO2 emissions from catalytic converters using urea, a source of emissions, was not addressed previously.
Estimated emissions from road transport can be based on two independent sets of data: fuel sold (see section 188.8.131.52) and vehicle kilometres. If these are both available it is important to check that they are comparable, otherwise estimates of different gases may be inconsistent. This validation step (Figure 3.2.1) is described in sections 184.108.40.206 and 3.2.3. It is good practice to perform this validation step if vehicle kilometre data are available.
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