Work No. 3d - The widening, alteration and realignment of the northbound on slip with associated embankments, cuttings, retaining walls and associated ground improvements (to increase bearing capacity), drainage, road signs, communications ducting, road lighting, utility diversions, realignment of existing noise barrier and landscaping commencing at grid reference 424895E; 558519N and terminating at grid reference 424636E; 558569N;