AS 4852.1:2009 Variable message signs
Where specified by the purchaser, the sign support structure shall provide a walkway and platform for access to the rear side of the installed sign. The rear access platform shall be designed in accordance with AS 1657 and provide for the full width of the sign enclosure. An integral safety railing is to be provided with the platform. The design and installation shall ensure that the sign enclosure’s doors are not obstructed by any part of the platform or by items used to secure the sign enclosure or safety rails to the platform. At any possible door opening positions, sufficient emergency exit space shall exist at all times from any location on the access platform in accordance with applicable wiring rules (refer to AS/NZS 3000) and statutory Occupational Health and Safety requirements. The platform shall be fitted with an expanded metal or mesh floor and toe plate that prevents objects from falling to the road below should personnel, undertaking maintenance of the sign, drop tools or parts.
Appropriate provisions shall be provided on the structure for mounting the sign. The mounting method shall ensure that the rear section of the sign enclosure and the face of the display modules are vertical with provision for adjustment as stipulated in Clause 2.1.2. It shall be possible to align the sign to point to the centre of the carriageway approach lanes at a distance of 250 m (100 m for Type A signs) from the face of the sign. Suitably designed struts or braces shall be provided to ensure stability of the installed sign.
The exterior shell shall be free from irregularities and free from fasteners such as bolts, screws and pop rivets. The interior and exterior of the control housing shall be free from sharp corners and projections which may cause injury. All exterior corners and the roof shall have a minimum external radius of 3 mm. All accessible edges shall be de-burred.