The harnesses tested were four of the top safety harnesses on the market. (looking at one of the images, I think one was a ruffrider because I recognize the orange straps). Here's another report on that story with more information:
Do dog seatbelts keep your pet safer? - Video on TODAY.com
For me, a proper crash tested dog crate is the only way to go. I purchased my variocage a month ago and my dogs are really happy and (hopefully) safe in it. The company I posted about was having a sale on the small ones - here's the link again if anyone is interested:
Variocage U.S. - Mim Variocage Dog Crate, Variocage Car Crash Safety Crate