The Insurance Institute for Highway Safety has put a new crop of large luxury vehicles through its crash test gauntlet, and the Cadillac CTS and Infiniti M joined some impressive company in scoring a Top Safety Pick designation. The CTS and M clinched the highly regarded award by receiving the top score of "Good" in roof strength testing. To achieve the top score in rollover safety, a vehicle's roof has to be able to support four times the weight of the entire vehicle.

The Top Safety Pick designation is handed out only to vehicles that received a "Good" score for all four IIHS crash tests while also featuring standard stability control to help avoid accidents altogether. The Cadillac and Infiniti join the BMW 5 Series, Lincoln MKS, Volvo S80, Hyundai Genesis and the Mercedes-Benz E-Class as Top Safety Pick winners.

Since large luxury vehicles cost so much and contain so many safety features, it's not all that surprising that so many models aced IIHS testing. But not all vehicles passed the test with flying colors. The Lexus GS and Audi A6 managed only an "Acceptable" score in roof testing, while the aging Acura RL lagged behind the competition with a "Marginal" rating. Hit the jump to read over the IIHS presser.


Gallery: 2011 Cadillac CTS sedan



Gallery: 2011 Infiniti M





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