The 2016 E-Class with Pre-Safe will take advantage of that reflex for more protection. If the car’s sensors determine that a crash is imminent and unavoidable, it will emit “pink noise” just before the actual, and likely very loud, crash. The pink noise is described as being similar to a waterfall or the rush of traffic. A short burst of pink noise is enough to trigger the stapedius reflex, as it’s known, and cause the middle ear to contract. Then when the crash occurs milliseconds later, there’s ideally less damage done to your hearing.