saabfan and rOO, you are assuming that they are skirting the crash testing. Yes, three wheel vehicles don't require it like a 4-wheeled vehicle, but they are still pursuing safety systems and crash testing (check their website, dudes!) The frame itself can support 4 times its own weight on the roof with little or no deformation.

From the Aptera website:
"Personal Armored Vehicle: Don’t believe us? Well, when you can carry the weight of two elephants on your roof with barely a dent you are doing something right.

"To Aptera, safety is not a punch line. It’s a fundamental principle that encompasses the protection of all things of value in your vehicle, including and, most importantly, you.

"Composite body structures provide an impact-resistant exterior that is lighter than steel but three times as strong. Front crash zones incorporate race car technology that absorbs and deflects energy to keep the cabin from harm. Integrated high-strength aluminum door beams transfer crash loads into the body and away from the cabin. And a complement of driver and passenger air bags is incorporated to ensure that each passenger is always secure."

They use 3 wheels for aerodynamics and drag, not to skirt safety.