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Growing traffic volumes, changing urban form and urban fringe development; and resultant changes in population density, have all contributed to a worldwide growth to traffic congestion.
As a result, there has been increasing interest in how intelligent transport systems can be used to counter the effects of urban congestion and infrastructure bottlenecks – reduced transport network efficiency and increased travel time, air pollution and fuel consumption.
Many new transport infrastructure projects are under construction in South Australia and the majority incorporate intelligent transport systems into the design and construction.
The ability and benefits of these systems is broad ranging, from road safety benefits to traffic flow improvements. In many cases, information and warning signs can be made available for vehicle drivers, water vessel operators and train and tram operators.
Variable speed signs, warning lights and variable message boards are an example of system currently operating throughout South Australia.
Variable speed limit signs on the South Eastern Freeway regularly alter in display to advise drivers of the current speed limits due to changed road conditions, commonly affected by inclement weather and traffic conditions ahead. Signage can be altered to display speed limits of 40, 60, 80, 90 (tunnel only) or 100km/h.

Likewise, red and amber warning lights located along the length of the Southern Expressway can be operated individually or in set segments, as required and these will be upgraded to variable speed limit signs this year.
The systems are controlled remotely by the department's state-of-the-art Traffic Management Centre at Norwood. The centre manages metropolitan Adelaide’s traffic flow – monitoring and taking any necessary remedial action at over 800 sites (including traffic signal sites in the Adelaide City Council); on the Southern and Port River expressways and the South Eastern Freeway, including the Heysen Tunnels.
To prevent accidents and minimise delays, the Traffic Management Centre welcomes being alerted to signal faults, incidents or congested sites on its 24-hour, toll free number: 1800 018 313.

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