Both the 7 Series and E-Class Sedan have child safety locks to prevent children from opening the rear doors. The 7 Series has power child safety locks, allowing the driver to activate and deactivate them from the driver's seat and to know when they're engaged. The E-Class Sedan’s child locks have to be individually engaged at each rear door with a manual switch. The driver can’t know the status of the locks without opening the doors and checking them.
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 7 Series are reminded to check the back seat if they opened the rear door before starting out. The E-Class Sedan doesn’t offer a back seat reminder.
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 E-Class Sedan doesn’t offer a front passenger side knee airbag.
When descending a steep, off-road slope, the 7 Series xDrive’s standard Hill Descent Control allows you to creep down safely. The E-Class Sedan doesn’t offer Hill Descent Control.
The 7 Series’ standard lane departure warning system alerts a temporarily inattentive driver when the vehicle begins to leave its lane and gently nudges the vehicle back towards its lane. A lane departure warning system costs extra on the E-Class Sedan.
To help make backing out of a parking space safer, the 7 Series has standard Cross Traffic Warning with braking function and automatically engage the brakes. Mercedes charges extra for Rear Cross-Traffic Alert on the E-Class Sedan.
Both the 7 Series and the E-Class Sedan have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, blind spot warning systems, rearview cameras, driver alert monitors, available all wheel drive and around view monitors.
The BMW 7 Series weighs 498 to 1854 pounds more than the Mercedes E-Class Sedan. The NHTSA advises that heavier cars are much safer in collisions than their significantly lighter counterparts.