Crash tests are designed to cover the most common type of real-world collisions and gauge performance in high-speed front and side crash tests, plus evaluate seat/head restraints for protection against neck injuries in rear impacts. The IIHS factors in vehicle size and type and designates vehicles as good, acceptable, marginal and poor. Last year, the IIHS gave Silver Awards for vehicles with "acceptable' ratings in some areas. This year only vehicles achieving "good" across the board have been selected as Gold and made the newest list of winners. While the list contains American-made models, there are currently no domestic brands to make the first round of awards, although testing will be on-going for newer 2007 models such as the Ford Edge and Lincoln MKX.