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aggregate application appointed asphaltic concrete base beams binder bitumen bridge British bypass Cambridgeshire carriageway cement cent centre chippings Civil Engineering compaction contract contractor cost County Council crete deck Department developed Director dual dual carriageway embankment Environment epoxy equipment excavation expansion joints Hertfordshire HIGHWAYS & ROAD hire hot rolled hydraulic improvement increased industry joint Laboratory Lane Limited load London M4 motorway machine maintenance Manager manufactured materials ment methods miles million motorway North operation pavement paving piles plant problems production programme quarry range reinforced concrete Road Construction Unit Road Research road surface rolled asphalt roller route scheme soil South span speed standard steel Street struction structure surface dressing Surrey Telephone Telex Throwley tion tonnes traffic traffic signals TRRL trunk road tunnel vehicle viaduct vibrating wearing course