Active safety: Helpful assistants

Numerous driving assistance systems offer support in the GLA and reduce the driver's workload. Standard-fit features for the SUV include ATTENTION ASSIST drowsiness detection and radar-based COLLISION PREVENTION ASSIST with adaptive Brake Assist, which helps in the GLA to protect against collisions from a speed of 7 km/h. Models with 4MATIC are equipped with DSR (Downhill Speed Regulation) as standard.
The radar-based COLLISION PREVENTION ASSIST system provides the possibly distracted driver with visual and acoustic warnings of identified obstacles and prepares Brake Assist for precision braking. This braking is initiated as soon as the driver firmly presses the brake pedal. When an impending danger of collision is identified, COLLISION PREVENTION ASSIST calculates the precise braking force ideally needed to avoid an accident and makes the best possible use of any distance remaining.
DSR: support on downhill stretches
Models with 4MATIC are equipped with DSR (Downhill Speed Regulation) and an off-road transmission mode as standard. DSR is activated by a control button in the centre console, and assists the driver on demanding downhill stretches by maintaining a slow, manually selected vehicle speed within the physical limits when negotiating downhill gradients. This is done with the help of the engine and transmission control systems, and by specific braking intervention.
Hill-Start Assist (standard feature of all GLA models), on the other hand, is able to prevent the vehicle from rolling back unintentionally when moving off on an uphill slope.
Electronic helpers: all the other assistance systems at a glance
Active Parking Assist, available as an optional extra on the GLA-Class, helps the driver to manoeuvre into and out of parking spaces. Twelve ultrasonic sensors located in the front and rear bumpers measure potential parallel and end-on parking spaces to the right and left of the road. As standard, a search is made on the right; on the left only if the direction indicator is activated. If a suitable space is found, after stopping the vehicle and engaging reverse gear the driver can activate the automatic parking aid using the control panel of the multifunction steering wheel. The system computes a suitable entrance path which requires a maximum of seven moves to park the vehicle. The driver is assisted while parking by activation of the electromechanical steering. However, the driver is still required to operate the accelerator and brake and select the gear. The parking speed is limited to 10 km/h. Parking on slight bends also is supported.
Automatic steering to exit the parking space is a new subfunction. If the vehicle has been parked using Active Parking Assist, the vehicle can be steered out of the longitudinal parking space in which the vehicle had previously been parked. For this the driver has to engage reverse and actuate the turn indicator before activating - via the control panel on the multifunction steering wheel - the automatic assistance function for manoeuvring out of parking spaces. Here, too, the driver has to operate the accelerator, brake and gearshift. As soon as the vehicle has assumed a sufficient angle to exit the parking space in one straight move, the wheels are set to the straight ahead position, the process ends and the driver assumes steering control again. The process is completed at the latest when the vehicle is at an angle of 45 degrees relative to the starting position.
A series of further assistance systems can be added to this:
  • Adaptive Highbeam Assist: when vehicles are detected ahead of or oncoming to the vehicle, this system automatically dips the beams and adjusts the range of the headlamps appropriate to the distance. The driver benefits from a longer dipped beam range and does not generally need to switch manually between main and dipped beam.
  • Intelligent Light System (ILS): with five light functions, automatically adapts to the weather and light conditions and the driving conditions. ILS comprises bi-xenon headlamps with variable light distribution and dynamic range adjustment for country roads, motorways and heavy fog, Adaptive Highbeam Assist, active curve light, LED daytime running lamps and headlamp cleaning system.
  • Blind Spot Assist: detects vehicles in the critical zone by means of two radar sensors located at the sides at the rear of the vehicle and warns the driver by displaying a red triangle in the exterior mirror. If the turn indicator is actuated the red triangle begins to flash and a warning tone is emitted.
  • Lane Keeping Assist: a camera behind the windscreen detects carriageway markings and can recognise if the car is about to leave a detected lane unintentionally.
  • Attention Assist (standard): provides a warning when typical signs of drowsiness are detected. The system's highly sensitive sensors observe the driver's behaviour and can recognise – especially on the basis of how the steering wheel is being moved – if the driver is becoming drowsy or inattentive.
  • Speed Limit Assist: a camera fitted behind the windscreen detects speed limit signs at the roadside and compares this data to information contained in the GPS system or the digital map. The relevant speed limit is then displayed in the instrument cluster.
  • Hold function of brake (standard): when stopping, for example at traffic lights, the driver merely has to press the brake pedal slightly more firmly once (and can then take his or her foot off the brake) to keep the brake engaged until moving off again. The brake is released automatically when the driver steps on the accelerator.
  • Reversing camera: integrated in the handle strip on the tailgate, the reversing camera features a wide-angle lens. When reverse gear is engaged, the image from the camera is transmitted to the screen of the Audio 20 system or the COMAND system. Static and dynamic guide lines assist the driver during manoeuvring.
  • DISTRONIC PLUS: radar-based adaptive cruise control supports the driver at speeds between zero and 200 km/h by automatically adjusting the distance from the vehicles in front. In doing so it is able to apply the brakes to bring the vehicle to a complete standstill and also accelerate it again. As a result, the system is also particularly convenient in stop-and-go traffic. If the system detects that the distance is being reduced too quickly, it warns the driver with both visual and audible signals.
  • Cruise control with Speedtronic: the cruise control maintains the preset speed. The additional SPEEDTRONIC function ensures that the saved speed is not exceeded. Both functions come as standard with the 7G-DCT dual clutch transmission and are optionally available for the models with manual transmission.
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