Tweaks to models put them over the top while others miss out due to substandard crash test results

IIHS finds most generally offer good protection while others have a ways to go on back-seat safety. Headlights are a dim feature for the group.

IIHS researchers using new store of data in effort to reduce crashes.

List focused on models with added safety, excludes those made for speed or that require more experience to handle.

IIHS says zero traffic fatalities may not be realistic, shoots for more attainable goal, challenging groups on the ground to join it.

Safety group says carmakers dramatically improved AEB systems.

Research shows moderate and serious injuries are more likely in crashes.

Nonprofit research shows motorcyclists vulnerable without protection, estimates number who would have survived with it.

Insurance Institute for Highway Safety gives the midsize models its highest safety rating.

Study found the addition makes drivers much more likely to stop in otherwise low-lighted areas.