I have the Safe & Smart package on my car with Lane Keeping, which has both Lane Keeping Aid and Lane Keeping Alert. Lane Aid actively steers the car away from the lane markings if the turn signal is not on. Lane Alert shakes the steering wheel if you approach the line without the turn signal.
The system can be configured so that either, neither, or both functions are on. If both are on, the way they are set up is that the car will actively try to move away from the line unless you push back against the car's steering attempt. After a few seconds, it stops trying to steer. Then, if you're still moving out of your lane, the wheel will shake as a warning. This is clearly how the system is intended to operate, as shown in the manual:
Anyone else think this is backwards? Wouldn't it make more sense to warn you that you are approaching the line before it tries to steer instead of the other way around? If you haven't caught on that you're moving out of the lane because of the steering attempt, the wheel shaking seems unlikely to add any additional notification.