Intelligent speed assist

Intelligent Speed Assist (ISA) is a safety technology that alerts drivers if they exceed the speed limit.

How does ISA work?

ISA uses global positioning (GPS) or satellite navigation technology to know what road a vehicle is travelling on. It compares this information with a digital map which contains the speed limit for that road at that location. If the vehicle is travelling faster than the speed limit, the driver will receive a visual and/or audio warning from the ISA device.

Road safety benefits

Research from around the world has shown that ISA can significantly reduce travel speeds and therefore crashes. Research undertaken by the TAC and MUARC in Australia estimates that ISA can reduce fatal and serious injury crashes by up to eight per cent.

VicRoads Repeat Speeders Trial

The results of a landmark study of Victorian motorists with a history of speeding has found that using speed alert devices can reduce speeding and potentially save lives.

VicRoads designed and conducted two trials, one involving repeat speeders attending a behaviour change discussion group, while the other used advisory ISA technology to warn drivers they were speeding. Researchers from the Monash University Accident Research Centre independently evaluated the trials.

Monash University Accident Research Centre Repeat Speeders Trial Final Evaluation Report [PDF 1.1 Mb]

Repeat Speeders Trial Final Evaluation Report Appendix [PDF 16.3 Mb]

Environmental benefits

Local and international research also indicates that the use of ISA produces fewer fluctuations in travel speed which results in a higher fuel efficiency and a subsequent decrease in vehicle emissions.

Some portable satellite navigation (GPS) devices already have speed limit information in them and can be set to provide a warning to drivers if they travel over the speed limit.

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