NEW YORK // Hyundai has added a feather to its cap after the US Insurance Institute for Highway Safety last week named the 2011 Sonata as its safety "best pick". To qualify for this, a car must earn a good rating in front, side, rear and rollover crash tests. It must also be equipped with electronic stability control. This year, the institute added a roof strength test to its parameters. Apart from the electronic stability control, Sonata's safety features include side-impact airbags, front and rear side-curtain bags, front-seat active head restraints, and anti-lock brakes with brake assist.