Aston Martin DB11 Owner's Handbook Manual page 111

If a vehicle is detected at speeds above approximately 30 km/h
(18 mph) and enters the monitoring range directly next to your
vehicle, the warning lamp in the exterior mirror will illuminate
amber. If a vehicle is detected close to your vehicle in the lateral
monitoring range and you switch on the turn signal indicator in
that direction the amber warning lamp in the outside mirror will
flash. If the turn signal indicator remains on, all other detected
vehicles are indicated only by the flashing of the amber warning
lamp. If you overtake a vehicle quickly, no warning is given.
The system can monitor vehicles when driving around curved
roads.
Operation Conditions
For the Blind Spot Assist system to operate the below conditions
must be met:
• Transmission must be in D (Drive).
• The vehicle must be moving at more than 30 km/h (18 mph).
• Vehicles in the blind spot area must be travelling at speeds of:
• more than 5 km/h (3 mph).
• between 5 km/h (3 mph) slower and 35 km/h (22 mph)
faster that your vehicle.
• The minimum width for a vehicle to be detected is 0.7 m
wide (a motorcycle for example).
System Limitations
The BSA system can be limited in its operation in the below
situations:
• The sensors are dirty or obstructed such as snow or mud on
the bumpers.
• Poor visibility weather conditions (snow, fog, heavy rain etc).
• Warnings may be incorrectly displayed near to crash barriers
or long solid barriers.
• Warnings can be interrupted when driving alongside long
vehicles such as vehicles with long trailers.
System activation
The BSA system can be activated or deactivated in the instrument
cluster menu (Refer to 'Instrument Cluster Menu', page 4.11).
5.13
Driving