longest tunnel in australia
Visit www.rta.nsw.gov.au 47/01. Opening six months ahead of schedule on 9th December, 2001 of Australia's longest road tunnel, a twin 4 km-long tube with a four-lane dual carriageway, plus a 550 m tunnel under the Cooks River on the M5 East between Bexley Road and Marsh Street as part of Sydney Orbital Road. Excavation began in June 1999.