Mercedes-Benz S-Class Coupe 2018 Operator's Manual page 159

The distance warning function can aid you in the following situations with an intermittent warning tone and a warning lamp:
Vehicles traveling in
front
Vehicles without Driv‐ up to approx. 155 mph
ing Assistance Pack‐ (250 km/h)
age
Vehicles with Driving up to approx. 155 mph
Assistance Package (250 km/h)
Autonomous braking function
The autonomous braking function may intervene at speeds starting from approximately 4 mph (7 km/h) in the following situations:
Vehicles traveling in
front
Vehicles without Driv‐ up to approx. 124 mph
ing Assistance Pack‐ (200 km/h)
age
Vehicles with Driving up to approx. 155 mph
Assistance Package (250 km/h)
Stationary vehicles Crossing vehicles
up to approx. 50 mph no reaction
(80 km/h)
up to approx. 62 mph up to approx. 43 mph
(100 km/h) (70 km/h)
Stationary vehicles Crossing vehicles
up to approx. 31 mph no reaction
(50 km/h)
up to approx. 62 mph up to approx. 43 mph
(100 km/h) (70 km/h)
Driving and parking 157
Crossing pedestrians Stationary pedes‐
trians
up to approx. 37 mph no reaction
(60 km/h)
up to approx. 43 mph up to approx. 43 mph
(70 km/h) (70 km/h)
Crossing pedestrians Stationary pedes‐
trians
up to approx. 37 mph no reaction
(60 km/h)
up to approx. 43 mph up to approx. 43 mph
(70 km/h) (70 km/h)