"In Subaru's crash test, performed at a Virginia laboratory that tests child seats on a device that speeds down a track and stops abruptly, the results show that devices such as dog tethers are prone to break in a crash, sending the dog rocketing into whatever is in front of it. Rather alarmingly, the organization reports a 100-percent failure rate. In other words, "None of the harnesses were deemed safe enough to protect both the dog and the humans in the event of an accident."
Ahh so the harnesses don't work at all in a crash . I wonder if secured crating is safer, but I can't fit my 65 lb dog crate in my car anyways.
I do believe a crate in your car for the dog is not safe either. They're prone to breaking in a crash. But I don't have the articles to back this up. I'd put a gate/divider between the front and back of my car before I'd put in a crate. But, like you, a crate for my 110#, hip high dog will not fit in my car.