On-Road Vehicle and Engine Emission Regulations

4 In these Regulations, a vehicle or engine is deemed to be covered by an EPA certificate if it

• (a) is equivalent to a vehicle or engine that is covered by an EPA certificate in that both vehicles or engines, as the case may be, share all of the features described in the CFR that are used by the EPA to classify vehicles or engines into test groups, and vehicles into evaporative and refuelling families; and

• (b) has no features that could cause it to have a higher level of emissions than the vehicles or engines tested for the issuance of the EPA certificate.