The Insurance Institute for Highway Safety (IIHS) has just come to a conclusion that we suspect many motorists have known for years - when it comes to car safety, size does matter.

• 在美国公路安全保险研究所（IIHS）刚刚结束，我们怀疑许多驾驶者都知道多年-说到汽车安全，大小确实关乎。