that were hit by it. The problem is "impact incompatibility", where the "hard points" of the end of chassis rails of SUVs are higher than the "hard points" of cars, causing the SUV to override the engine compartment and crumple zone of the car. There have been few regulations covering designs of SUVs to address the safety issue. The heavy weight is a risk factor with very large passenger cars, not only with SUVs. The typically higher SUV bumper heights and those built using stiff truck-based frames, also increases risks in crashes with passenger cars. The Mercedes ML320 was designed with bumpers at the same height as required for passenger cars. In parts of Europe, effective 2006, the fitting of metal bullbars, also known as grille guards, brush guards, and push bars, to vehicles such as 4x4s and SUVs are only legal if pedestrian-safe plastic bars and grilles are used. Bullbars are often used in Australia, South Africa, and parts of the United States to protect the vehicle from being disabled should it collide with wildlife. Safety improvements during the 2010s to the present led automobile manufacturers to make design changes to align the energy-absorbing structures of SUVs with those of cars. As a result, car occupants were only 28 percent more likely to die in collisions with SUVs than with cars between 2013 and 2016, compared with 59 percent between 2009 to 2012, according to the IIHS. Visibility and backover deaths Larger vehicles can create visibility problems for other road users by obscuring their view of traffic lights, signs, and other vehicles on the road, plus the road itself. Depending on the design, drivers of some larger vehicles may themselves suffer from poor visibility to the side and the rear. Poor rearward vision has led to many "backover deaths" where vehicles have run over small children when backing out of driveways. The problem of backover deaths has become so widespread that reversing cameras are being installed on some vehicles to improve rearward vision. While SUVs are often perceived as having inferior rearward vision compared with regular passenger cars, this is not supported by controlled testing which found poor rearward visibility was not limited to any single vehicle class. Australia's NRMA motoring organisation found that regular passenger cars commonly provided inferior rearward vision compared to SUVs, both because of the prevalence of reversing cameras on modern SUVs and the shape