of which 12.3% are heavy goods vehicles. Incidents In August 2008, the tunnel was closed to northbound traffic due a landslide in bad weather conditions. The tunnel was also closed temporarily following the 2010 Canterbury earthquake and subsequent aftershocks to allow for structural integrity inspections to take place. Service generally resumed within 20 minutes of each aftershock. The tunnel was again closed following the February 2011 Christchurch earthquake. The tunnel canopy was severely damaged by rockfall and was demolished within days. Following initial engineers' inspection the tunnel reopened to emergency vehicles later the same day. Access was limited to Lyttelton residents only from 26 February before fully reopening. The Tunnel Control Building was also badly damaged and deemed unfit for occupation. It was subsequently demolished in early 2013, and a new purpose-built Lyttelton Tunnel Control Building for managing the tunnel's operation and maintenance was constructed and completed in June 2014. A community celebration was held on 31 August 2014 to jointly open the new Lyttelton Tunnel Control Building and commemorate the tunnel's 50th anniversary. To manage the operation and maintenance of the tunnel the Lyttelton Road Tunnel Administration building designed by Christchurch architect Peter Beaven was constructed at the Heathcote end of the tunnel. The distinctive building was given a New Zealand Historic Places Trust Category 1 listing in 2008. Operation Cyclists are not allowed to use the tunnel, although for many years they were allowed to pass through on one day a year. For example, the 2001 tunnel ride was held in conjunction with the 3rd NZ Cycling Conference. However, since 2007 Christchurch buses have been equipped with bicycle carriers to allow cyclists access between Heathcote and Lyttelton. Images References External links Christchurch – Lyttelton Road Tunnel Official Opening Booklet Lyttelton Road Tunnel The Christchurch – Lyttelton Road Tunnel Booklet published by the Christchurch Lyttelton Road Tunnel Committee in 1956. Road tunnels in New Zealand Transport in Christchurch Tunnels completed in 1964 Road tunnel Former toll tunnels Transport buildings and structures in Canterbury, New Zealand