One alternative to rumble strips is to simulate them in the car by vibrations in the driver's seat. Citroen has a lane departure warning system in the models C4 and C5 which has been evaluated from user experience. A focus group was carried out with four users from Ostergötland. From the discussion a questionnaire with accompanying diary was constructed and sent out to Citroen owners in Sweden having a lane departure warning system. A large part of the users have not received any information about the system at the time of buying the car. The majority of the users are satisfied with the lane departure warning system but almost all declare not to use it at all in winter which indicates that it should be improved to be used all the year round.

The results point towards that the system has a good price level, but many still think that it should be a part of the standard equipment meaning that safety should not be optional. Noise and vibrations are considerably lower in C4 and C5 compared to milled rumble strips. Many drivers are disturbed by false alarms. Therefore more apparent warnings demand a reduction of false alarms. The most important result is that more information and guidelines should be given to the users. Function and shaping of the lane departure warning system should also be improved. Citroen has satisfied customers willing to pay for well functioning support systems.