New frontal crash tests of 12 small cars by the U-S Insurance Institute for Highway Safety found only one vehicle worthy of the ``good'' rating.
The four-door Mini Cooper Countryman received top standing, while the Chevy Volt, Mitsubishi Lancer and Subaru B-R-Z were considered ``acceptable.''
The Mazda5 was among the worst performers because its side air bags didn't deploy and its driver's side door unlatched.
19 of the 32 small cars tested have earned "good" or "acceptable" ratings on the small overlap test.
Vehicles must earn "good" or "acceptable" ratings for small overlap protection and "good" ratings on the institute's other four crash tests, in order to be a top safety pick.