Limitations for brake assistance
Extra equipment
Low-hanging objects, e.g. a flag/pennant for projecting load, or accessories such as auxiliary lamps and bull bars that are higher than the car bonnet limit the function since they may obstruct the camera or radar unit.
Skidding
On slippery road surfaces the braking distance is extended, which may reduce the capacity of the function to avoid a collision. In such situations, the anti-lock brakes and the stability control ESC (Electronic Stability Controlv) are designed to give the best possible braking force with maintained stability.
Low speed
The function is not activated at very low speeds – below 4 km/h (3 mph) – and the system therefore does not intervene in situations where your car is approaching a vehicle ahead very slowly, e.g. when parking.
Active driver
Driver commands are always prioritised. The function does not intervene in situations where the driver is steering and accelerating in a decisive manner, even if a collision is unavoidable. Active and aware driving behaviour can therefore delay a collision warning and intervention in order to minimise unnecessary warnings.
Limitations for steering assistance
In certain situations the function may have limited functionality and fail to intervene in the following cases, for example:
- for small vehicles, such as motorcycles
- if the majority of the car has moved into the adjacent lane
- on roads/in lanes with unclear or non-existent lane markings
- outside the speed range 60-140 km/h (37-87 mph)
- steering assistance for evasive manoeuvres: outside the speed range 50–100 km/h (30–62 mph)
- as the steering servo for speed-dependent steering wheel resistance is working at reduced power – e.g. when cooling due to overheating.
Other demanding situations can include:
- road works
- winter road conditions
- narrow roads
- poor road surface
- a very “sporty” driving style
- poor weather with reduced visibility.
In these demanding situations, the function may have difficulty helping the driver correctly.
Important warnings
Warning
Driver supports only warn of obstacles which their radar unit has detected – hence a warning may not be given, or it may be given with a certain delay.
- Never wait for a warning or intervention. Apply the brakes when the situation requires.
Warning
- Automatic braking can prevent a collision or reduce collision speed, but to ensure full brake performance the driver should always depress the brake pedal – even when the car brakes automatically.
- The warning and steering assistance are only activated if there is a high risk of collision – you must therefore never wait for a collision warning or for the function to intervene.
- The function does not activate any automatic brake interventions in the event of heavy acceleration.
Warning
- Warnings and brake interventions could be implemented late or not at all if a traffic situation or external influences mean that the camera and radar units cannot detect pedestrians, cyclists, large animals or vehicles correctly.
- For vehicles to be detected at night, their headlamps and rear lamp cluster must be switched on and shining clearly.
- Warnings for stationary and slow-moving vehicles, as well as large animals, may be disengaged due to darkness or poor visibility.
- Warnings and brake interventions for pedestrians and cyclists are deactivated at vehicle speeds exceeding 80 km/h (50 mph).
- The system can provide effective warnings and brake interventions as long as the relative speed is below 50 km/h (30 mph).
- For stationary or slow-moving vehicles, warnings and brake interventions are effective at vehicle speeds up to 70 km/h (43 mph).
- Speed reduction for large animals is less than 15 km/h (9 mph) and can be achieved at vehicle speeds above 70 km/h (43 mph). The warning and brake intervention for large animals is less effective at lower speeds.
- Do not place, stick or mount anything on the outside or inside of the windscreen in front of or around the camera unit – this can interfere with camera-dependent functions.
- Objects, snow, ice or dirt in the area of the camera and radar units may reduce their functionality, fully deactivate them or give incorrect function response.
Note
This function uses the car’s camera and radar units, which have certain general limitations.
Important
Maintenance of driver support components must only be performed at a workshop – an authorised Volvo workshop is recommended.
Collision Avoidance – steering assistance for evasive manoeuvres
Steering assistance can assist the driver to steer away from an obstacle when it is not possible to avoid a collision by braking alone. Steering assistance is always enabled and cannot be deactivated.
The function engages by amplifying the driver’s steering input, which only occurs after the driver has begun to take evasive action – and then only if the driver is not steering enough to avoid a collision. In parallel with the amplified steering input, the brake system is also used to further amplify the steering input. The function also helps to straighten the car again after passing the obstacle.
- vehicles
- cyclists
- pedestrians
- larger animals.
Assistance at risk of collision in crossing traffic
Assistance at risk of collision (Collision Avoidance) can assist the driver when turning and crossing the path of an oncoming vehicle at an intersection.
For the function to detect an oncoming vehicle on a collision course, the oncoming vehicle must first enter the sector in which the function can analyse the situation.
- your car’s speed must be at least 4 km/h (3 mph).
- your car must turn to the left in markets with right-hand traffic (or to the right in left-hand traffic).
- the oncoming vehicle must have its headlamps switched on.
The function may have difficulty in assisting the driver if, for example:
- there are slippery driving conditions and stability control (Electronic Stability Control (ESC)) intervenes.
- an oncoming vehicle is detected too late.
- an oncoming vehicle is obscured by something.
- the oncoming vehicle has headlamps switched off.
- the oncoming vehicle drives in an unpredictable manner, for example, abruptly changes lanes at a late stage.
Warning
Warnings and steering assistance due to an impending collision with an oncoming vehicle always come very late.
Note
This function uses the car’s camera and radar units, which have certain general limitations.
Assistance at risk of collision in oncoming traffic
Assistance at risk of collision (Collision Avoidance) can assist the driver to give steering assistance to avoid a collision with vehicles in the oncoming lane. The function can also reduce the speed of the car in order to reduce the force of an impact in the event of encroachment into the car’s own lane.
Meeting in own lane
If an oncoming vehicle enters your car’s lane and a collision is unavoidable, the function can reduce the car’s speed with a view to reducing the force of the impact.
- Your car
- Oncoming vehicles
For this function to work, the following criteria must be met:
- your car must be travelling at more than 4 km/h (3 mph)
- the road section must be straight
- your car’s lane must have clear lane markings
- your car must be positioned straight in its own lane
- the oncoming vehicle must be within your car’s lane markings
- the oncoming vehicle must have its headlamps switched on
- this function can only handle “front to front” collisions
- this function can only detect vehicles with four wheels.
When drifting across to oncoming traffic
The function can help a distracted driver who does not notice that the car is drifting into the oncoming lane.
- Oncoming vehicle
- Your car
The function is active within the speed range 60-140 km/h (37-87 mph) on roads with clearly visible lane markings/lines. If the car is about to leave its own lane while an oncoming vehicle is approaching at the same time, the function can help the driver to steer the car back into its own lane. However, the function does not intervene with steering assistance if the direction indicator is used. If the function detects that the driver is actively driving the car, activation of the function will be delayed. When the function intervenes, a symbol and a message are shown in the driver display, and an acoustic signal can be heard as well.
Warning
Warnings and steering assistance due to an impending collision with an oncoming vehicle always come very late.
Note
This function uses the car’s camera and radar units, which have certain general limitations.
Collision Avoidance to help avoid impact with a vehicle in the driver’s blind spot
(Option/accessory)
Collision Avoidance (Collision Avoidance) can help a driver who does not notice that the car is about to leave its own lane while an oncoming vehicle is approaching at the same time, either from behind or in the blind spot.
The function can assist by steering the car back to its own lane.
- The function can even assist if the driver intentionally changes lanes using direction indicators without noticing that another vehicle is approaching.
- The function is active within the speed range 60-140 km/h (37-87 mph) on roads with clearly visible lane markings/lines.
- The lamps in the door mirrors flash at the same time as the steering input. An acoustic signal can also be heard.
- When the function intervenes, a message is shown in the driver display.
Warning
Warnings and steering assistance due to an impending collision always come very late.
Note
This function uses the car’s camera and radar units, which have certain general limitations.
Assistance at risk of run-off
Assistance at risk of collision (Collision Avoidance) can help the driver and reduce the risk of the car accidentally leaving the road by actively steering the car back onto the road. The function has two levels for intervention:
- Steering assistance only
- Steering assistance with brake intervention
Intervention with steering assistance
Brake intervention helps in situations where steering assistance alone is not sufficient. The brake force is adapted automatically depending on the situation at the time of road run-off. The function is active within the speed range 65-140 km/h (40-87 mph) on roads with clearly visible lane markings/lines. The car’s camera unit scans the edges of the road and the painted lane markings. If the car is about to leave the side of the road, the car can be steered back onto the road and if the steering intervention is not enough to avoid a run-off, the brakes are also activated, However, there is no intervention from the function with either steering assistance or brake intervention if the direction indicators are used. If the function detects that the driver is actively driving the car, activation of the function will be delayed. When the function intervenes, a message is shown in the driver display.
Warning
Warnings and steering assistance due to an impending collision with an oncoming vehicle always come very late.
Note
This function uses the car’s camera and radar units, which have certain general limitations.