CASE STUDY

摘要

A significant milestone on the journey to countless summer holidays, the Conwy Tunnel on the A55 has been making travel to the north Wales coast and the hills of Snowdonia easier for motorists since 1991.Constructed at a cost of £237 million, it was the first 'immersed tube' tunnel to be built in Britain and almost 25 years later it has recently achieved another first; becoming the first 70mph 'long tunnel' in the country - it is 1,090m long - to be lit entirely by LEDs. FLEXIBLE LIGHTING LEVELS The lighting for the Conwy Tunnel's westbound carriageway was upgraded two years ago, using a combination of LED and conventional lighting.Advances in higher powered LED technology since then will now enable both energy and maintenance savings to be achieved in the eastbound tunnel, from the combination of efficient long-life LED fittings and photometer light sensors linked to a SCADA (supervisory control and data acquisition) control system.