Speed-limiting devices should be fitted to cars on a voluntary basis to help save lives and cut carbon emissions, according to a new report.

The government's transport advisers claim the technology would cut road accidents with injuries by 29%.
The device automatically slows a car down to within the limit for the road on which it is being driven.
But charity Safe Speed says the devices are dangerous because they encourage drivers to enter a "zombie mode".

Ministers are planning to help councils draw up digital maps with details of the legal speed on every road.
The speed-limiting devices will then use satellite positioning to check a vehicle's location and when its speed exceeds the limit, power will be reduced and the brakes applied if necessary.
The Commission for Integrated Transport and the Motorists' Forum, which both advise the government, are calling on ministers to promote a wide introduction of the system.
Overtaking worries

John Lewis, from the Motorists' Forum, told BBC Breakfast he believed the devices would help drivers obey limits and therefore keep their licences.
"But we believe that the system should be a voluntary system, that the drivers decide if they have fitted to their car or not, and that they decide if they want to over-ride the speed limit - that should be their choice," he added.
But Claire Armstrong, from the road safety charity Safe Speed, told BBC Five Live that truck drivers using similar speed-limiting devices had been shown to "go into fatigue mode or zombie mode" and stopped paying attention to the road.
"That makes it highly dangerous in those scenarios. So you've taken the responsibility away from the driver and that is not [good] for road safety," she said.
Derek Charters, from the Motor Industry Research Association, also believes limiting speed automatically could be dangerous.
"The last thing you need is one car to be overtaking and then pull back in, in front of the cars in front, because that braking event will then cause everybody to start to slow down, which will then compress the traffic, which then causes an incident."



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