Instead, look for the technology to roll out gradually, building on systems that are already available, like adaptive cruise control, active braking, lane-keeping systems and parking assist.

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Many of the enabling technologies, such as adaptive cruise control and lane departure warning systems, already exist.

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Autonomous driving in slow traffic is a logical combination of adaptive cruise-control and the lane-keeping systems, already available in some vehicles, which either warn the driver if the car starts to drift out of lane, or apply corrective steering to keep it in lane.

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The Driver Assist package, debuting now, goes a step further by intervening to avoid a crash through its Adaptive Cruise Control, Automatic Collision Preparation, and Front and Rear Automatic Braking systems.

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The G-wagen also gets into step with the latest generation of Mercedes's infotainment and Internet systems, as well as safety tech such as (optional) adaptive cruise control, parking assist and blind-spot assist.

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