Submission #1952 - Tasman Highway - Holyman Avenue intersection upgrade, near Hobart International Airport, Tasmania Title of Proposal - Tasman Highway - Holyman Avenue intersection upgrade, near Hobart International Airport, Tasmania Section 1 - Summary of your proposed action Provide a summary of your proposed action, including any consultations undertaken. 1.1 Project Industry Type Transport - Land 1.2 Provide a detailed description of the proposed action, including all proposed activities. Overview The Holyman Avenue roundabout on the Tasman Highway provides direct access to Hobart International Airport (HIAPL) and is a corridor connector for the growing residential areas of Sorell and the Southern Beaches. The Tasman Highway is a Category 1 Trunk Road under the Tasmanian State Roads Hierarchy and is a major urban corridor into Hobart. It also provides tourist access to the Great Eastern Drive on Tasmania’s East Coast. Currently the Tasman Highway is a dual carriageway to just west of Holyman Avenue. The existing Holyman Avenue roundabout is operating at near-capacity, and it is predicted that future traffic growth will significantly increase queuing and delay time for vehicles, particularly during peak periods. The Hobart International Airport Master Plan predicts that vehicle traffic using the airport will increase from the current figure of approximately 10,000 vehicles per day to 27,000 vehicles per day within 20 years as a result of increased passenger numbers, increased freight task and commercial development within the airport precinct. The predicted growth for HIAPL is discussed extensively in the 2015 Hobart Airport Master Plan (https://hobartairport.com.au/wp- content/uploads/2017/02/HIA_MasterPlan_FINAL_030316__compressed__smaller.pdf). The Master Plan identifies efficient and reliable ground transport to and from the airport as an essential component of the predicted growth. Upgrading of the Holyman Avenue intersection was identified as part of a submission to the Nation Building 2 (NB2) Program in 2012 and has now been confirmed as a priority upgrade project for commencement of construction in 2017/18. The project became an election commitment at the 2016 Australian Government election and the Department of State Growth’s intention is to award a contract in January 2018 for construction of the new interchange. Following a comprehensive options analysis process in November 2016 that investigated 11 different options, a signalised diamond interchange was selected as the preferred concept for the new interchange. Current and future traffic volumes indicate that grade separation of the Tasman Highway and Holyman Avenue is necessary in order to provide an acceptable level of service for the Tasman Highway - Holyman Avenue Intersection. The current preferred concept design has a smaller footprint and contained entirely within the land that was acquired in 1992. Submission #1952 - Tasman Highway - Holyman Avenue intersection upgrade, near Hobart International Airport, Tasmania The design for the project also needs to ensure that a connection is maintained to Cranston Parade which is a local road that provides access to 3 substantial land parcels to the west of the airport on the southern side of the Tasman Highway. Extensive investigation of available options for a relocated Cranston Parade determined that the most suitable option for Cranston Parade is a left turn in - left turn out arrangement connecting to the westbound on ramp (ramp connecting Hobart Airport to the Tasman Highway). This option is sub optimal from a traffic operation perspective but does enable Cranston Parade to be located where it does not impact on the identified areas of lowland grasslands. Design Parameters for the Preferred Option are summarised below and drawings of the concept design are attached. Design Guidelines and Standards The concept design for the interchange has been developed using the guidelines and standards listed below: Department of State Growth - Standard Brief for Professional Services Austroads Guide to Road Design Part 3: Geometric Design Austroads Guide to Road Design Part 4A: Unsignalised and Signalised Intersections Austroads Guide to Road Design Part 6: Roadside Design, Safety and Barriers. A design speed of 110 km/h has been adopted for the Tasman Highway and for the on and off ramps A design speed of 60 km/h has been adopted for Holyman Avenue, Kennedy Drive and Cranston Parade Typical cross sections are provided in the attached concept design drawings. The key features are summarised below. Tasman Highway Lane widths 3.5 metres Outside shoulder 2.0 metres Inside shoulder 1.0 metre Existing Median 13 metres on western approach to Holyman Avenue narrowing to 8.0 m at Holyman Avenue New Median 8 metres at Holyman Avenue narrowing to 2.1 metres with a flexible safety barrier east of Holyman Avenue Holyman Avenue/Kennedy Drive Lane widths 3.5 metres Shoulders 1.0 metre Median in 4 lane sections 2.1 metres Cranston Parade Lane widths 3.0 metres Shoulders 1.0 metre The concept design retains the existing horizontal alignment of the Tasman Highway for the section west of Holyman Avenue. At Holyman Avenue the existing median is 8 metres wide and heading east the design gradually transitions this median down to a width of 2.1 metres with a Submission #1952 - Tasman Highway - Holyman Avenue intersection upgrade, near Hobart International Airport, Tasmania flexible safety barrier. Gradient The existing highway has a downgrade grade of approximately 2% from west to east and the concept design retains the highway at existing levels. To achieve the required clearance for Tasman Highway traffic, Holyman Avenue needs to be lifted above the Tasman Highway by approximately 8 metres resulting in embankments on the approach to the new bridge of approximately 10 metres recognising that the existing highway is approximately 1.8 metres above natural surface. The gradient on both the Kennedy Drive and Holyman Avenue approaches to the structure is 3%. Maximum gradients on the ramps are Eastbound off ramp 3.8% Eastbound on ramp 3.6% Westbound off ramp 4.6% Westbound on ramp 3.9% Construction The new interchange retains the Tasman highway at existing levels and requires lifting Holyman Avenue to pass over the Tasman Highway. Approximately 140,000 cubic metres of imported fill will be required to construct the elevated Holyman Avenue and connecting on and off ramps onto the Tasman Highway. Preliminary geotechnical investigation indicates that the underlying ground will be subject to settlement and ground improvement may be required to ensure that foundations for the new embankments are satisfactory. The new bridge taking Holyman Avenue over the Tasman Highway will be a forty metre long reinforced concrete structure four lanes wide with a design life of 100 years. Road pavements will be crushed rock with bituminous surfacing and a design life of 25 years. At the end of 25 years the pavements can be rehabilitated to extend their life. Road furniture includes safety barrier (wire rope, concrete barrier and galvanised steel), traffic lights, street lights on galvanised steel masts and road signs. 1.3 What is the extent and location of your proposed action? Use the polygon tool on the map below to mark the location of your proposed action. Area Point Latitude Longitude General area 1 -42.834021102144 147.48163017204 containing road proposal General area 2 -42.834021102144 147.48163017204 containing road proposal General area 3 -42.83350182928 147.48364719321 containing road Submission #1952 - Tasman Highway - Holyman Avenue intersection upgrade, near Hobart International Airport, Tasmania Area Point Latitude Longitude proposal General area 4 -42.832195760062 147.48538526466 containing road proposal General area 5 -42.831881040461 147.48452695777 containing road proposal General area 6 -42.831424694193 147.4830463784 containing road proposal General area 7 -42.83114144309 147.48317512443 containing road proposal General area 8 -42.831707943997 147.48630794456 containing road proposal General area 9 -42.831692207931 147.48834642341 containing road proposal General area 10 -42.831109970665 147.49062093665 containing road proposal General area 11 -42.830307418417 147.49229463508 containing road proposal General area 12 -42.828576387893 147.49516996314 containing road proposal General area 13 -42.828780966754 147.49562057426 containing road proposal General area 14 -42.829205859147 147.49493392875 containing road proposal General area 15 -42.830700827684 147.49270233085 containing road proposal General area 16 -42.831550583155 147.4908140557 containing road proposal General area 17 -42.831865304438 147.48941930701 containing road proposal General area 18 -42.832242967863 147.48920473029 containing road proposal Submission #1952 - Tasman Highway - Holyman Avenue intersection upgrade, near Hobart International Airport, Tasmania Area Point Latitude Longitude General area 19 -42.832447534588 147.49023469856 containing road proposal General area 20 -42.833863747191 147.49223026206 containing road proposal General area 21 -42.833989631185 147.49203714301 containing road proposal General area 22 -42.834823606169 147.48886140754 containing road proposal General area 23 -42.834855076703 147.48660835197 containing road proposal General area 24 -42.833895218214 147.48452695777 containing road proposal General area 25 -42.834430223145 147.48190912177 containing road proposal General area 26 -42.834021102144 147.48163017204 containing road proposal 1.5 Provide