The BMW 7 Series has standard driver and front passenger side knee airbags mounted low on the dashboard. These airbags helps prevent the driver and front passenger from sliding under their seatbelts or the main frontal airbags; this keeps them better positioned during a collision for maximum protection. Knee airbags also help keep the legs from striking the dashboard, preventing knee and leg injuries in the case of a serious frontal collision. The S90 doesn’t offer a front passenger side knee airbag.
Over 200 people are killed each year when backed over by motor vehicles. The 7 Series has standard Active Park Distance Control that uses rear sensors to monitor and automatically apply the brakes to prevent a rear collision. The S90 doesn’t offer backup collision prevention brakes.
When descending a steep, off-road slope, the 7 Series xDrive’s standard Hill Descent Control allows you to creep down safely. The S90 doesn’t offer Hill Descent Control.
An active infrared night vision system optional on the 7 Series helps the driver to more easily detect people, animals or other objects in front of the vehicle at night. Using an infrared camera and near-infrared lights to detect heat, the system then projects the image on the windshield, near the driver’s line of sight and even aims one of the vehicle’s headlights in the direction of the person or object. The S90 doesn’t offer a night vision system.
Both the 7 Series and the S90 have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, plastic fuel tanks, 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, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors and available all wheel drive.