A55 Trunk Road - LED Road Lighting
Location: A55 Conwy
Client: NMWTRA (North & Mid Wales Trunk Road Agent)
The project objectives were to provide energy, carbon emissions and cost savings in operation of the road lighting. In addition, because of high traffic flows particularly in the summer holiday season, there are restrictions to placing traffic management on the road that prevent maintenance and repair works being done. Any solution needed to address this requirement for a robust design with low maintenance requirements.
The customer decided to use the existing lighting columns and brackets on site, so the specification was for a light-weight, low wind area lantern providing lighting to class ME2 at the existing column spacing. To achieve further energy savings during periods of low traffic flow, the customer required lanterns to be dimmable to lighting class ME3a via the Telensa Central Management System (CMS) between midnight and 6am.
Both traditional high pressure sodium and new LED lantern options were developed and evaluated as part of the economic assessment.
The project used an Invest- to-Save model using capital funding to invest in new lantern assets that could provide the energy and carbon savings required.
Three full lighting scheme options were developed from the mapping of the site considering 250W and 150W SON-T lanterns and the CU Phosco P850 main road LED lantern at both ME2 and ME3a lighting classes.
A Total Cost of Ownership and Payback Period calculation was completed to illustrate the initial capital investment versus relative energy and maintenance costs and savings.
The final assessment showed the P850 lantern to be the most suitable, meeting the specification requirements (a lightweight, robust design, low maintenance lantern) and also providing the optimum total cost of ownership through the savings in energy and maintenance.
CU Phosco P850 lantern required a single LED optic solution. The lantern was programmed to one of three maximum power levels which can then be dimmed as required using the integral CMS controls. The limited number of variants benefits the installing contractor by simplifying the processes for ordering, delivery, storage and picking for installation.
CU Phosco P850 incorporates the Aeroflow® thermal management solution which maximise life of the Philips Lumileds Luxeon M LEDs. The reflector design is such that the lantern can achieve a G6 luminous intensity class when installed with 0? tilt. Weighing less than or equal to 15kg depending on configuration.
CU Phosco, acted as design agent and product supplier through our Contractor Framework tender. They supplied a competent team with a strong knowledge of road lighting design, product application, carbon reduction discipline and outstanding technical support.
Their team programmed design works and applied the client’s key process within the delivery of the initial design and feasibility stages.
The design team were issued a brief to undertake a carbon reduction assessment across over 18 miles of illuminated highway across the A55 North Wales Expressway. Its entire length is a dual carriageway primary route. All junctions are grade separated, except for two roundabouts J15 (Llanfairfechan) and J16 (Penmaenmawr). The assessment included 10 junctions on route, between J13 and J23. The A55 forms part of the Euroroute E22.
The team prepared designs well within program, and were able to respond to the frequent changes in program and client requirements.
The team demonstrated strong knowledge of legislation, standards and other policies relating to the Highway Lighting discipline. The design and technical team offered valued input into product application.
The first phase rollout of Carbon Reduction implementation was undertaken during the J16/J16A Penmaenmawr to Dwygyfylchi Major Maintenance scheme. The contract was awarded to Dawnus Construction LTD. The highway lighting package of works included the renewal of 348 Lanterns and accompanying CMS dimming and remote monitoring.
The CU Phosco P850 solution was specified by the contractor under the design. The lantern was perfectly suited to the task, demonstrating both an efficient lighting optic and lightweight design to accompany the existing road lighting column infrastructure. The P850 proves to be one of the leading aesthetic designs on the market. The lantern uses a unique thermal management solution, this being a key requirement for any solid state technology.
The lead in time and delivery of equipment was ahead of schedule, which allowed the lighting renewal phase to begin ahead of initial program. The technical support team offered an excellent level of service, with a presence on site and remote assistance throughout the entirety of the scheme.
Phase 1 of Carbon Reduction was completed in advance of the initial program, with no equipment failures or issues to report.
Richard Cochran, Electrical Asset Manager
38% Energy Saving, 59% During Dim Regime