Rollover evaluations

Microcars

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
Smart Fortwo 2008-13 models		1,828	9,896	5.41
Scion iQ 2012-13 models		2,130	9,555	4.49