Road and Infrastructure Cess imposed on petrol and diesel; notifications grant temporary exemptions and adjust excise duty incidence on blends and refineries. Imposition of a Road and Infrastructure Cess on petrol and high speed diesel has immediate provisional effect; accompanying Central Excise notifications rescind earlier exemptions, adjust basic excise duty rates, provide specified exemptions for ethanol-blended petrol and biodiesel, and preserve limited concessions for certain refineries while amending exemption applicability by reference to manufacture and clearance dates.