6Mechanical, structural and display requirements#
6.1General#
The mechanical and physical requirements defined in MRTS201 General Equipment Requirements apply to work provided under this Technical Specification. Additional mechanical and physical requirements for equipment provided under this Technical Specification are described below.
6.2Design life#
The TCMS shall be suited to the intended operational environment. Unless otherwise specified, the design life of the TCMS components including the panels, motor and the mechanical drive system shall be 10 years.
6.3Mounting requirements#
6.3.1General#
The display enclosure shall be capable of being mounted on a support structure in a location consistent with QGTTM / AGTTM requirements. The mounting structures supporting the TCMS shall be designed for the site conditions in which they are intended to be used. Calculations for wind loading shall be in accordance with the requirements of TRUM Manual, Volume 3, Part 5: Design Guide for Roadside signs
6.3.2Pole support#
The sign support shall be designed in accordance with TRUM Manual, Volume 3, Part 5: Design Guide for Roadside signs when installed with all supporting hardware and accessories used to operate the sign, including the solar panels, where fitted.
The design documentation showing compliance with this Technical Specification and certified by a RPEQ, shall be submitted to the Principal’s representative for review and acceptance. Hold Point 2
6.4Exterior finish and surfaces#
All internal and external surfaces shall be free from sharp edges or protrusions.
The front facing surface colour apart from the rotating elements shall be matt black. Other surfaces should be a lighter colour, preferably matt grey, to reduce internal enclosure temperature.
6.5TCMS Display#
The TCMS shall consist of fabricated triangular elements mounted in a display enclosure.
The fabricated triangular elements shall rotate and align to display one of three faces.
Messages shall be displayed using a motor actuator to effect the change and each message shall be displayed directly.
The rotation of the triangular elements shall be bi-directional such that messages requested by the HHD is displayed with one-third (1/3) of a full rotation in the appropriate direction.
In the event of power loss, the TCMS shall continue to display the last message shown just prior to electric power loss. The TCMS shall have a mechanism for manually changing the display in the event of power loss or loss of communication with the HHD.
The fabricated triangular elements may be mounted in either the vertical or horizontal plane.
6.5.1TCMS motor actuator#
The motor actuator and all necessary mechanical linkages and electrical circuitry shall be installed in the display enclosure.
The motor actuator shall be able to withstand mechanical stresses arising from the expected number of message rotations for the life of the sign.
6.5.2TCMS message appearance#
The dimensions of the signs and each message shall comply with the MUTCD requirements for static signs. Message combinations used on site shall be in accordance with approved Traffic Guidance Scheme (TGS) and not create contradictory advice. The retroreflective message stickers shall adhere to the triangular prism for the duration of the project.
The retroreflective material for each message shall comply with the requirements for retro-reflective sheeting described in MRTS14 and AS/NZS 1906 Hold Point 3
6.6Enclosures#
All telecommunications equipment, the TCMS control unit, the battery charger/regulator and the batteries shall be installed in an integral enclosure, or display enclosure, complying with the requirements of MRTS201 General Equipment Requirements. The sign enclosure shall be made of marine-grade aluminium alloy 5251 H32 to conform to AS/NZS 1734.
The display enclosure shall provide a degree of protection of not less than that required for the classification of IP65 in accordance with AS 60529 in normal service.