Works Approval Report.pdf - the National Capital Authority

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Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development AgencyIt is proposed that the speed limit within the Campbell Section 5 development be a maximum of40km/hr.To help create a low speed environment, minimum traffic lane and parking bays dimensions havebeen selected to alter driver behaviour.Positioning of street furniture and tree planting near the kerb helps reduce vehicle speeds by visuallynarrowing the road and results in motorists becoming more speed aware. This also creates wideopen verges to support the active frontages, creating an improved environment for pedestrians andcyclists.8.3.6 New road horizontal alignmentsSeveral new internal access roads will be created as part of the subdivision and public realm workswithin the site. The proposed streets and corner radii have been designed to Austroads Standardsand checked using vehicle swept path software. The following turning template vehicles wereselected to satisfy TAMS’ Waste Collection Vehicle and Austroads requirements:Design vehicle: 9.9m TAMS Waste Collection Vehicle*;Checking vehicle: 12.5m Single Unit Truck / Bus*.* The design vehicle for Road 1-(C) is a 5.2m Car/Van, and the Checking vehicle is the 9.9m TAMSWaste Collection Vehicle.According to Austroads, the design vehicle should represent 85% of vehicles; however, designing toaccommodate the 9.9m TAMS Waste Collection Vehicle is thought to be appropriate for all roadsexcept Road 1-(C).It is accepted that the probability of a 12.5m Single Unit Truck/Bus accessing the site frequently isunlikely. It has therefore been deemed acceptable for this category of vehicle to utilise the fullcarriageway for some manoeuvres and to encroach into the opposite traffic lane, as allowed undernote 7.1.2 of Austroads 2006 Design Vehicle and Turning Path Templates.Corner radii of 6m have been provided and proved throughout most of the internal roads to theCampbell Section 5 development by the vehicle swept path tracking exercise. The exceptions areRoad 3 and at intersections with external roads where larger radii kerb returns have been selected.8.3.7 New road vertical alignmentsAll new Road pavements will generally have two-way crossfall at 3%, except Anzac Park East whereone-way crossfall is proposed.Longitudinal grades of between 1% and 3.5% are proposed throughout. Grades of at least 1% havebeen specified to ensure satisfactory drainage.November 2012 Cardno 54
Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development Agency8.3.8 Verge treatmentIt is proposed that the verge treatment within the Campbell Section 5 development reflects designintent from the Canberra Central Design Manual. All internal road verges within the development willbe fully paved in either reinforced concrete or granite pavers on a reinforced concrete slab. Streetswith active frontages, including Road 3 and Road 1-(C), will be treated with granite segmentalpaving. Details of the different paving areas and construction details can be found in the landscapedrawings.A crossfall of 2 – 3.5% will be applied to all verges.The proposed verges within the Campbell Section 5 development are typically 5.5m).The verges have been designed to accommodate the proposed tree planting and all servicesthroughout the development.8.3.9 Tree plantingTree planting is proposed within the streetscape, both within the verge and between parking bays atcarriageway level where specified on the drawings. The trees are to be setback 1.5m from the faceof the kerb unless otherwise specified; no additional allowance has been made for the trunk of amature tree. Tree pits have been generously sized and designed to accommodate the selectedspecies of tree.Following discussions with TAMS on the location of trees in close proximity to the kerb, at theirrequest a reinforced beam beneath the kerb has been designed to resist the upward forces of treeroots. Root barrier, root director and stratacell (or similar urban planting solutions) have beenspecified to protect trees, paved areas and pavements. A summary of the tree pits and treatment isincluded in Appendix 11.Positioning the trees 1.5m from the kerb allows lighting and street furniture to be located away fromthe desire line, creating a more urban, open and accessible streetscape, balancing the size ofdevelopable blocks against verge width.It is noted that developments in Kingston and the recently completed external works at Mode3 onLonsdale Street Braddon, do not meet the TAMS requirements for tree setback from the kerb.8.3.10 On-street parkingIn line with the expectations of the client, the objective has been to create an urban environment withthe greatest possible balance of the street reserve apportioned to pedestrians.Public on-street parking will be provided throughout the development and all proposed kerb sideparking spaces will be indented to the verge, with the exception of Road 2-(C). Indenting the parkingNovember 2012 Cardno 55
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