DETROIT — Most electronic systems that take on some driving tasks for humans don’t adequately make sure drivers are paying attention, according to an insurance industry study.

Better front crash prevention technology in passenger cars could prevent 5,500 rear-end accidents with medium and heavy trucks, according to the Insurance Institute for Highway Safety.

An aftermarket device that attaches to the sides of a tractor-trailer successfully prevented a midsize car from sliding underneath the trailer in a 40 mph crash test, Insurance Institute for Highway Safety officials said. See crash test video.