2005 Mercedes E-Class Owner's Manual - Page 239

Controls in detail Driving systems Distronic displays in the speedometer dial Under no circumstances should the driver await the intermittent warning sound before braking. See the following warning note. The intermittent warning sound ceases and the red DTR warning lamp l goes out when the necessary distance to the vehicle ahead is again established. 1 Segments 1 Set speed If Distronic is activated, one or two segments come on around the set speed. If Distronic detects a vehicle directly ahead, the segments from the speed of the vehicle ahead to the set speed come on. If Distronic calculates that there is a danger of collision: The DTR warning lamp l in the instrument cluster comes on red. An intermittent warning sounds. Immediately brake the vehicle to avoid a collision. i The vehicle speed displayed on the speedometer can briefly vary from the speed setting on the Distronic system. 237