and C options were rejected early in the planning process. Four type A options were identified and all involved extensive tunnelling. The four type A options were put to public in 2003, and were denoted by colours: 'Purple' option: from the F3 at Wahroonga to the M2 at the existing Pennant Hills Road/M2 interchange, generally following the alignment of Pennant Hills Road. It will consist of mostly tunnels with an open cut adjacent to the railway corridor and in the vicinity of Brickyard Park at Thornleigh. 'Blue' option: dual tunnels from the F3 at Wahroonga to the M2 at the existing Pennant Hills Road/M2 interchange, generally following an alignment to the east Pennant Hills Road 'Yellow' option: dual tunnels from the F3 at Wahroonga to the M2 at North Epping, with direct connections to the east and west at M2 'Red' option: dual tunnels from the F3 at Wahroonga to the M2 at Macquarie Park, with direct connections to the east and west at M2. This followed the alignment of the cancelled Lane Cove Valley Expressway The study report by SKM was released in April 2004. On 6 May 2004, the Deputy Prime Minister and federal Minister for Transport and Regional Services, John Anderson, and the federal Minister for Local Government, Territories and Roads, Senator Ian Campbell, announced that a preferred corridor had been chosen for a new link to be constructed from the F3 Freeway to the Sydney Orbital. The preferred corridor was the 'Purple' option, which was long, mostly in tunnel, and would connect the F3 Freeway at Wahroonga to the M2 Motorway at Pennant Hills Road interchange. The federal government strongly preferred that the corridor be fully tunneled which would ensure that there would no opening in Brickyard Park. The corridor was also the most favoured by the public in submissions. On 19 February 2007, the federal Minister for Local Government, Territories and Roads Jim Lloyd announced the establishment of an independent review of the F3 to M7 Corridor Selection. The review was carried out by Mahla Pearlman , who is a former Chief Judge of the NSW Land and Environment Court. The review was completed in August 2007 and the report was released on 14 September 2007. The conclusions of the report were that the proposed tunnels should proceed but that planning for the longer term connection between the F3 and the M7 should also commence