The Scottish road network extends to some 54,000 km. It provides a vital link for the needs of the people and industry of Scotland. A total of some 50 billion person kilometres are travelled on Scotland’s roads annually.
Maintenance of this essential road network therefore requires utilisation of the latest technology and systems available in order that traffic flow and road safety are continuously improved as road usage and vehicle numbers increase. Lighting can play an important role. One example of how this has been put into practice is the project undertaken by South Lanarkshire Council at Bothwell Road, Hamilton. This dual carriageway is one of the main arteries between Hamilton and the M74. The Council wished to covert the existing 135W Low Pressure Sodium luminares to High Pressure Sodium whilst maintaining the existing column positions and mounting height. The width of Bothwell Road and its associated footpaths, together with the specified maximum wattage of 150W, presented a challenge. ‘Here the obvious solution was to use the Philips Iridium luminaires.’ Says Dick Leonard, Sales Engineer for Philips Road Lighting in Scotland. ‘ Its modular construction and wide choice of optical, electrical and mechanical combinations makes it possible to accommodate a multitude of customer needs. The design includes a twin central bracket therefore meeting the need of the Bothwell Road specification of two luminaires per column.’ In order to achieve the best possible road lighting it is essential to have optics tailored to the specific demands of the respective application. The Client specified that the installation should comply with BS5489 Category 2.1 and CIE CLASS R1, with a reflection coefficient of Qo 0.80, was used. This normally requires reduced spacing to achieve the desired uniformities and by implication an increase in energy usage. However, this requirement, combined with the need for the existing spacings to be maintained meant that standard optics would not meet the desired specification. The Philips Optical Technology (POT ) already provides an excellent choice of optics for wide spacings across medium and wide carriageways but has now been developed further with the introduction of the XT – POT ( eXtended spacing Tubular lamp - POT ) making it ideally suited for extra wide installations on dual carriageways such as this. This is the world’s first ever lighting installation of its kind using the XT-POT Optic. Shallow glass bowls were considered to be the preferred option, as they would assist in the reduction of light pollution.The use of the Philips Iridium luminaire with its high specification optical control enabled us to achieve the desired lighting levels using 150W High Pressure Sodium luminaires. Contractors, AMEY, installed one hundred and forty-six units in total yielding considerable energy savings. The XT-POT optic enabled efficient illumination of the dual carriageway and the two adjacent three metre footways.Said David Todd, Transportation Engineering Manager for South Lanarkshire Council. For more information please contact: Barbara Wheeler tel 020 8781 8140 or fax 020 8781 8929 email barbara.wheeler@philips.com Philips Lighting, 420-430 London Road, Croydon CR9 3QR
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