Our Electrical Engineers were engaged by RoadPro Consulting to design street lighting to accommodate proposed road widening and safety improvements. The lighting category was assessed as Category V3 of AS/NZS 1158.1.1:2005 along Lower King Street, Caboolture.

Due to the irregular nature of the lighting geometry and channelization, an illuminance-based design was appropriate as per AS/NZS 1158.1.1:2005 clause 3.4.2. For category V3 design a minimum horizontal illuminance of 7.5 lux on the road surface at intersections and raised traffic management devices as well as 3.75 lux extending 3m from the edge of the defined intersection carriageway.  In addition, a luminance design was conducted that included a curve spacing adjustment calculation applied to the maximum luminance spacing table.

Road work and associated lighting was completed in conjunction with an Energex 11kV overhead line relocation project.  Existing Rate 1 & 2 street lighting was modified to include the installation of five (5) L175 and L100 streetlights and Energex network poles.

The existing Rate 2 lighting on the Lower King Street roundabout was recovered and a Rate 3 lighting scheme was installed with fourteen (14) L175 LED street lights installed in a single sided arrangement. Five lights were installed surrounding the Lower King Street roundabout with an additional 3-way high mast light in the centre, with new Rate 3 switchboard to TMR specification.

Constraints:

Identifying suitable streetlight locations that maintained dynamic clearances from powerlines.

Identifying suitable streetlight locations and switchboard location clear of open spoon drains and flood areas.    Coordination with Energex asset relocation project to relocate overhead powerlines.

Engineering consultants

The road works were designed by the Department of Transport and Main Roads

Accredited Energex contractors

The road lighting installation was constructed by RoadTek