Advanced driver support systems are often used by drivers as comfort systems. Drivers tend to adapt their behavior to the increased safety margins created by the system by driving at higher speeds and paying less attention to driving. From a traffic safety perspective, it is therefore important that driver support systems can adapt their support to how drivers actually use the system. We propose a way to mitigate drivers misuse of the safety margins created by the system by employing an adaptive support policy that is less predictable for the driver. We conclude by describing ongoing work, were the safety effect of such an adaptive support policy is empirically studied.