Pretending to doze off, I let the car drift gently to the left.

CNN: Behold the?all-seeing, self-parking, safety-enforcing, networked car

Another system uses cameras to detect when the car begins to drift, emits a warning and can automatically steer the car back into the lane.

FORBES: Automakers On The Road To Self-Driving Cars

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.

ECONOMIST: Inside story

In Gwynedd, a couple were trapped in their car in a snow drift near Bala for 18 hours before being led to safety by rescuers at 08:00 GMT on Saturday.

BBC: Wales weather: Power restored after heavy snow