To give sufficient headroom to the rear passengers the roof stays high, and then rolls down abruptly to meet the boot. (cardekho.com)
Another requirement is that roofs maintain sufficient headroom during testing. (iihs.org)
There's no shortage of space up front, but the rear seating area is a bit cramped — passengers over six feet (1.83 m) lack sufficient headroom and legroom. (drivemag.com)