Mandatory speed-limiter devices in cars could prevent up to 29% of injuries on the roads, according to a Government advisory body.
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The Commission for Integrated Transport (CfIT) believes intelligent speed adaptation (ISA) technology could reduce the number of injuries on roads, but is not calling for a mandatory introduction of such devices.
The report was also prepared by the Motorists' Forum, a sub-group of CfIT which ensures motoring interests and car users' views are fully reflected in road policy.
ISA technology warns drivers of local speed limits and can reduce speed to bring vehicles in line with those speed limits, if allowed.
The report concluded that on 70mph roads, adherence to the speed limit could lead to savings of up to 6% in CO2 emissions with a mandatory system.
Both organisations are calling for the Department for Transport to consider encouraging take-up of the technology.
CfIT vice-chairman David Leeder said: "This important report shows the very real benefits to motorists from the introduction and use of an ISA system - not just in road safety but also in terms of fuel and money saved."
Sir Trevor Chinn, chairman of the Motorists' Forum, said: "The UK has an enviable record on road safety but we still kill nearly 3,000 people on our roads each year.
"This report shows the potential substantial savings in injury accidents that could be achieved through the introduction of ISA. The fact that the report is backed by our members, who represent interests across the motoring spectrum, is testimony to the desire of the motoring world to work with government to make our roads even safer."