Audi offers highly developed assistance systems for the A4 family, for making driving even more relaxed. Standard on all variants is the new driver information system with break recommendation - it detects and draws the driver's attention to deviations from typical driving behavior on the basis of steering motions and other parameters.

The adaptive cruise control assistance system keeps the Audi A4 at a constant distance from the preceding vehicle at speeds between zero and 200 km/h (124.27 mph). If the threat of a rear-end collision becomes imminent at speeds below 30 km/h (18.64 mph), the system will execute a full brake application. Audi active lane assist supports the driver in keeping to his lane. A camera detects the lane markings and the system makes slight corrections to the steering if necessary. Audi side assist monitors the space behind the Audi A4 by radar and detects any vehicles in the blind spot, for example.

Infotainment systemsAudi offers a whole kit of state-of-the-art infotainment systems for its A4 series. The chorus CD radio with eight speakers is standard, while the MMI navigation plus system with large hard disk, color monitor, 3D graphics and DVD player forms the top of the line. Voice control and the optional digital audio broadcasting are further improvements to the system.

The high-end supplement to the MMI navigation plus system is the Bluetooth online car phone. Via Audi connect the system provides special services in the car, such as voice-controlled Google searches for points of interest and navigation with Google Earth pictures, along with Google Street View. Audi online traffic information, another such service, gives the driver the latest news on congestion along the selected route. The WLAN hotspot, another feature of the Bluetooth online car phone, allows passengers in the Audi A4 to surf the internet and send e-mails as they please with their mobile devices.