The 500e has standard whiplash protection, which use a specially designed headrest to protect the driver and front passenger from whiplash. During a rear-end collision, the whiplash protection system moves the headrests forward to prevent neck and spine injuries. The Cooper SE doesn’t offer a whiplash protection system.
The 500e’s optional blind spot warning system uses sensors to alert the driver to objects in the vehicle’s blind spots where the side view mirrors don’t reveal them. The Cooper SE doesn’t offer a system to reveal objects in the driver’s blind spots.
To help make backing out of a parking space safer, the 500e’s optional Rear Cross Path Detection uses sensors in the rear to alert the driver to vehicles approaching from the side, helping the driver avoid collisions. The Cooper SE doesn’t offer a rear cross-path warning system.
Both the 500e and the Cooper SE have standard driver and passenger frontal airbags, front side-impact airbags, driver knee airbags, side-impact head airbags, front seatbelt pretensioners, front wheel drive, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, rearview cameras, driver alert monitors and available front parking sensors.

