@kyleq16 If it is just a regular car, normal sized vehicle and going at that speed, then I think there is still a great chance of failure with serious injuries, possibly ending up in a wheelchair/vegetable. Like others have said, it is NOT really reliable (except maybe like a semi-truck or train.). Traumatizing others aside, if you are going via this method, then a train or semi-truck would offer more reliability and even then it is still risky.
There is literally no reason you shouldn't do this method by concern for the person driving the vehicle. People really don't have empathy for others and are just socially conditioned & deluded to think everyone cares about one another. Maybe if you're poor you force yourself to think that and to survive with other persons of similar status.
I agree with this, and while I personally aim to avoid and minimize trauma for others, I will never put them before my suffering if that means compromising or reducing the reliability of such methods. I can understand why others may be forced to take methods that may result in traumatizing others and I don't blame them for it. I blame society, government, and religion for putting suicidal people in such a desperate situation (where they don't have access to super reliable and peaceful methods, N, EB, inert gases, etc.) where they resort to such gruesome and desperate methods just to exit their suffering.