A year after the Insurance Institute for Highway Safety introduced it, many automakers are still having trouble designing cars that can do well on the "small overlap" crash test.
A small overlap crash happens when just the corner of the front of a car hits something, like another car, or a tree or a pole.
That kind of a crash can bypass the "crumple zone" of the front of the car, which is meant to absorb the force of the crash, protecting the people inside the passenger compartment from death or injury.
IIHS recently tested 12 small new cars for small overlap protection; only one, the Mini Cooper Countryman, received the highest grade of "Good."
Five others, the Chevy Volt, the Ford C-Max Hybrid, the Mitsubishi Lancer, the Scion FR-S, and the Subaru BRZ, got the next highest mark of "Acceptable."
Because the Chevy Volt also offers buyers the option of a front collision warning, the Institute gave the car its Top Safety Pick Plus award.
Four cars got a "Poor" rating, including the Fiat 500-L, the Nissan Juke, the Nissan Leaf, and the Mazda 5.