IN THIS FEATURE A lesson from Asimov A helping hand, not a babysitter Quick thinker Don't try this around town Allowing you to focus on what matters

The system is limited to turns of up to 0.2g, or a minimum radius of 230 metres. Which means it's fine on most motorways and some of the more gentle slip roads. But if the curve is too great, or there aren't two sets of white lines for it to pick up, you're on your own. It only operates between 45mph and 112mph, too.

As I discovered, however, if the road is straight you can pretty much relax and let the car steer for you. It's more than capable of making small corrections to counter the effects of camber and bumpy surfaces. Eventually, it will cotton on to your laziness. But this can take up to 30 seconds.

...but go astray and icon turns orange and beeps

When it does deactivate, all you need do is apply a hint of steering lock and it immediately comes back into play. That's the beauty of this set-up - it really wants to help you out. It's also very simple to use.

Press a button on the steering wheel and both systems power up. Then, when you're up to speed and in your chosen lane, simply press the individual LKAS and ACC pads behind the wheel. A hollow outline of a car between two hollow sets of lanes appears on the dash. When the car becomes solid, the cruise control system has locked on a car ahead. And when the lines fill, the lane keep assist is in play. It'll only do so once you've been driving in the middle of the lane for three seconds, though, and goes into standby mode when the indicators are being used.