Americans for Fuel Efficient Cars
I can't think of any modern cars that don't have that protection. The larger vehicles Pickup, SUV's are more dependent on mass and limited crumple zones.
Read the link and find out why more deaths and injury's result in SUV and pickup crashes. Midsize cars actually have less fatality's even though there are many more on the road.
SUV's and pickups that rollover are only 3% of accidents but they cause 30% of fatality's each year.
Having been a Firefighter/Paramedic for a number of years in Rescue/Ambulance/and Hospital and Mortuary I have seen the results of more that one-thousand accidents. I know what death looks like and where it comes from.