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Vehicle-to-vehicle communication and a cruise function will be fitted in different top-of-the-range GM models.
It will be the first time that automated technology is made available at higher speeds.
The 2017 Cadillac CTS sedan, which will go on sale in 2016, will have the necessary transmitters and receivers fitted as standard.
The equipment will let it know the location and speed of other vehicles, as long as they are also fitted with the technology.
A different model, as yet undisclosed, will offer a “Super Cruise” function, which keeps the vehicle in the centre of the lane, maintains speeds on the motorway and controls braking.
That could mean keeping to the speed limit, but would also allow the car to take control in stop-go traffic jams.