Speed feedback signs (also referred to as speed radar signs, speed LED signs, Vehicle Activated Signs, Speed Indication Devices or speed radar VMS) detect vehicle speeds (using laser speed-detection equipment, for example) and currently, the speed and/or a message (e.g. SLOW DOWN) is displayed on an electronic sign. The primary purpose is to make drivers aware of their speed and encourage them to reduce their speed through the worksite. Research indicates that these are very effective in reducing drivers speed for short term purposes.
Speeds above the speed limit must not be displayed on the sign, i.e. just a message, such as SLOW DOWN, should be shown.
New Changes Effective
As of 1 February 2024 speed feedback signs must be used at static worksites on Main Roads’ roads when all the following apply:
• Workers on foot are not protected by a road safety barrier; and
• Works conducted at the location for a duration of 8 hours or more; and
• Traffic volume of 15,000 vpd (AADT) or more; and
• There is a temporary speed reduction of 30 km/h or more
The list of roads where this is mandatory include the following;
The speed feedback display does not have to be displayed at all times e.g. the display may be turned off and the device used to gather speed data when trialing other speed control measures.
Speed feedback signs are not recommended to be used when there are more than 2 lanes of traffic travelling in one direction. Speed feedback signs may be used at other locations to encourage motorists to reduce speed and/or to collect speed data. The speed feedback sign must be included in the TGS.
Technical Requirements
Speed feedback signs should meet the following requirements:
• Have a display area of at least 430 mm x 430 mm
• Be positioned within or just in advance of the work area
• Be positioned at least 30 m or the distance as shown in table 2.2 of AGTTM Part 3, whichever is greater, from traffic signals, so as not to cause motorist confusion
• The lower edge of the sign be a minimum of 1 m above the level of the nearest lane
• The display and optical requirements in accordance with AS 4852.2: 2019 Variable message signs Part 2: Portable signs.
• Be calibrated to specified tolerances in accordance with manufacturer specifications and calibrated at intervals specified by the manufacturer.
• Have the ability to display speed and message for a minimum period of five seconds
• Have a minimum 100 metre detection range and the ability to display a message every three seconds
• Have the ability to obtain speed data and prepare reports using proprietary software for export to Excel compatible file
For more information on vehicle activated signs refer to the Main Roads Policy and Guidelines for Vehicle Activated Signs.
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