The A-Class has the very latest driving assistance systems with cooperative driver support, and thus provides the highest level of active safety in this segment with functions adopted from the S‑Class. For the first time, the A-Class is able to drive semi-autonomously in certain situations. To do this, it keeps a close eye on the traffic situation: improved camera and radar systems allow it to see up to 500 m ahead. The A-Class also uses map and navigation data for assistance functions.
For example, Active Distance Assist DISTRONIC as part of the Driving Assistance Package is able to provide route-based support to the driver in numerous situations, and to predictively and conveniently adjust the speed, e.g. when approaching bends, junctions or roundabouts. Also on board are e.g. Active Emergency Stop Assist and intuitively understandable Active Lane Change Assist .
The new A-Class comes with expanded Active Brake Assist as standard. Depending on the situation, it can effectively help to mitigate the consequences of rear-end collisions with slower-moving, stopping or stationary vehicles ahead, and even with crossing pedestrians and cyclists, or prevent them altogether.
Active Lane Keeping Assist (likewise standard) is able to warn the driver by means of pulsed vibrations in the steering wheel when the vehicle is unintentionally drifting out of its lane at speeds between 60 and 200 km/h. If the vehicle passes over a solid line, it can pull the vehicle back into lane by applying the brakes on one side. In the case of a dotted line, such intervention takes place only when there is a danger of collision with a vehicle in the adjacent lane (including danger from oncoming traffic).
PRE-SAFE® PLUS can recognise an imminent rear-end collision. If the danger of a collision persists, the system can also firmly apply the brakes of the stationary vehicle, thus minimising the risk of injuries by reducing the forward jolt caused by an impact from the rear.
Passive safety: highly stable passenger compartment and modern restraint systems
The new A-Class is also the first Mercedes-Benz model to have been developed at the new Technology Centre for Vehicle Safety (TFS). The design of the vehicle structures incorporates findings from research into real accidents. Every single body shell component was developed according to the loads and stresses encountered, with respect to geometry, material thickness, joining technology and material quality (increased proportion of high-strength and ultra-high-strength sheet steel).
The centrepiece of the body's safety concept is the highly rigid passenger compartment. Its great rigidity when subjected to accident-induced stress e.g. in frontal, lateral or rear-end collisions and roll-overs is above all due to the greater use of high-strength, ultra-high-strength and press-hardened sheet steel.
Driver and front passenger each have a three-point seat belt with belt force limiter and belt tensioner. In conjunction with the PRE-SAFE® system (optional equipment), the front seats are equipped with reversible belt reel tensioners. Both of the outer rear seats are fitted with a seat belt with reel tensioner and belt force limiter. The new A-Class is equipped with driver and front passenger airbags, a driver's knee airbag and window airbags as standard. Unlike in many competing models, the window airbag also covers the A-pillar for more complete passenger protection. Thorax-pelvis side airbags are likewise standard in the front, and available as optional equipment for the rear.