The standard safety equipment you get on the 2015 BMW 4-Series includes a full suite of airbags, stability control, adaptive brake lights, and anti-lock brakes. The 4-Series also includes an Automatic Collision Notification system that relays important information to emergency responders. Bluetooth is standard, too, but a rearview camera is an option on the more basic models—yes even though we're speaking of a model that costs more than $40k and has less than ideal outward visibility.
You can crank up the 4-Series' safety margins—and its sticker price—with the rearview camera and park distance sensors, as well as a surround-view camera system that has a top view and a bird's-eye view of obstacles approaching at low speeds. Full-LED headlamps with automatic high beams are also available. Optional blind-spot monitors are coupled with a lane-departure warning system include a camera-based collision-warning system with braking capability. Active cruise control is also offered, and it has the ability to stop the car, and to restart and carry a slow pace with traffic. The only thing we have trouble justifying (as it feels like a novelty after the initial 'wow' and a few demos to friends) is parking assist, a feature that allows the car to parallel-park itself.
There haven't yet been crash-test ratings released from the National Highway Traffic Safety Administration (NHTSA) and Insurance Institute for Highway Safety (IIHS) for the 2015 BMW 4-Series.
The 3-Series sedans have earned impressive ratings from the IIHS, although the 4-Series is different enough such that its scores won't merely carry over. We're also curious whether it will share the 3er's "marginal" score on the IIHS' new small-overlap crash test, or whether it will do better.