Rollover evaluations

Large luxury cars

To measure roof strength, a metal plate is pushed against one corner of a vehicle's roof at a constant speed. The maximum force sustained by the roof before 5 inches of crush is compared to the vehicle's weight to find the strength-to-weight ratio. This is a good assessment of vehicle structural protection in rollover crashes.

Each model is rated based on our measured curb weight of a vehicle with typical engine, transmission, and equipment options. However, when the same model is available in a configuration over 10% heavier than the typically equipped vehicle, a separate rating is assigned.

More about how we rate vehicle roof strength

Good   Acceptable   Marginal   Poor   |   Vehicles are listed in order of performance

Model	Overall rating	Curb weight (lb)	Peak force (lb)	Strength-to-weight ratio
Saab 9-5 2010-12 models		3,832	22,434	5.85
Mercedes E class 2-door 2010-13 models		3,736	20,852	5.58
Mercedes E class 4-door 2010-13 models		3,880	20,961	5.40
Hyundai Genesis 2010-13 models built after January 2010		3,862	19,000	4.92
Audi A6 2012-13 models		3,734	18,314	4.90
Lexus GS 2013 models		3,743	18,267	4.88
Hyundai Equus 2011-13 models		4,528	22,032	4.87
Cadillac XTS 2013 models		4,083	18,066	4.42
Volvo S80 2007-13 models		3,756	15,989	4.26
Infiniti M37/M56 2011-13 models		3,821	16,085	4.21
Rating does not apply to M56x (V8 4-wheel drive) and M Hybrid models. Rating of these models is Acceptable.
Lincoln MKS 2009-13 models		4,172	17,461	4.19
Cadillac CTS 2011-13 models		3,939	16,212	4.12
BMW 5 series 2011-13 models		3,803	15,364	4.04
Rating does not apply to 6-cylinder 4-wheel drive and all V8 models. Rating of these models is Acceptable.
Audi A6 2005-11 models		3,855	14,701	3.81
Lexus GS 2006-11 models		3,718	12,590	3.39
Rating does not apply to the GS Hybrid (gas-electric) version of this model. Rating of the GS Hybrid is Marginal.
Acura RL 2005-12 models		4,051	10,419	2.57