Intelligent Speed Adaptation (ISA) is the system which uses information and communications technology to provide speed limit information on a vehicle's dashboard, usually with a digital road map of the kind used in satellite navigation systems with the speed limit data for every road added in. ISA can be advisory, or it can be linked to the vehicle's engine management system to provide an intervening ISA, which can be voluntary and therefore able to be overridden, or mandatory and unable to be overridden. The study aimed to estimate, through the voluntary use of an ISA system, the impact on people killed or injured in road accidents; the impact on pollutants emissions and fuel consumption; other benefits or non-benefits; cost benefits; critical mass at which benefits increase rapidly; how greater take-up and usage of voluntary ISA can be encouraged; and ways of advising how to overcome non-benefits. The advisory and mandatory variants were considered too, but dynamic ISA which provides speed limits that change with current conditions was not covered in this study. (Author/publisher)
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