It's A Simple Explanation

The Surprising Other Reason Cars Keep Getting Bigger

[T]here are many reasons cars keep getting bigger. The presence of tougher safety standards is one. Americans simply defaulting to larger cars when they can and seemingly hating little cars is another.

But as Automotive News’ Ryan Beene points out, making cars bigger also allows automakers to deal with lower fuel economy and emissions targets.

(Jalopnik.com)