Many advanced safety technologies are already available on high-end vehicles that slow or stop cars if drivers don’t act quickly on their own. The Insurance Institute for Highway Safety is releasing evidence that these brakes are keeping cars from crashing and is also studying other advanced safety features. IIHS estimates these crash-avoidance features have the potential to prevent or at least lessen the impact in 1.9 million crashes a year and help prevent one out of three fatal crashes.