Never has been.It isn't secure
I did 65mph on my little 20" BMX when I was 15 holding onto the door of my buddies trans am . It was quite scary too, the tires were moving closer and closer to the car and it felt like I was going to crash, that would have left a mark or two lol.Those speeds are crazy. I think I have gotten up to the high 30's on a mountain bike and thought I was going to die. LOL