approximately 710 asphalt-paving contractors , government entities ( states , counties , cities and townships ) and asphalt roofing shingle manufacturers . we also produce asphalt cements , polymerized asphalt , asphalt emulsions and industrial asphalts . retail marketing ssa , our wholly-owned subsidiary , sells gasoline and merchandise through owned and operated retail outlets primarily under the speedway ae and superamerica ae brands . diesel fuel is also sold at a number of these outlets