In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the 5 Series are reminded to check the back seat if they opened the rear door before starting out. The S6 doesn’t offer a back seat reminder.
Over 200 people are killed each year when backed over by motor vehicles. The 5 Series has a standard Active Park Distance Control that uses rear sensors to monitor for objects to the rear and automatically applies the brakes to prevent a collision. The S6 doesn’t offer backup collision prevention brakes.
The 5 Series has a standard blind spot warning system that uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them and moves the vehicle back into its lane. A system to reveal vehicles in the S6’s blind spot costs extra.
To help make backing out of a parking space safer, the 5 Series has standard Cross Traffic Warning and Brake Intervention automatically engages the brakes to help avoid a collision. Audi charges extra for rear cross-path warning on the S6.
The 5 Series’ driver alert monitor detects an inattentive driver then sounds a warning and suggests a break. According to the NHTSA, drivers who fall asleep cause about 100,000 crashes and 1500 deaths a year. The S6 doesn’t offer a driver alert monitor.
Both the 5 Series and the S6 have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, rearview cameras, available all wheel drive and around view monitors.