Can the Billboard still be 3D on a bus?

After looking back at my research I really liked the different 3D billboards that I came across and stood out. I wanted to consider turning the 2D billboard into a 3D billboard. I needed to consider all the possible affects if I was to do this. I looked into creating it 3D however I do feel that it could be a potential danger hazard if I did this. If my billboard was to come out of the bus at the back it could cause accidents or can create hazards incase the driver does not see the object hanging off the bus in the mirror and hits it. It could also fall off into the road which is already creating a hazard. I then considered instead of having the billboard hanging over the sides of the bus, maybe have it going over the top of the bus, going in the upwards direction taller than the bus. I thought about this, but I had to consider tunnels and height restrictions. By buses having this billboard on their bus they may not be able to go particular routes and can also be a danger hazard. After considering all these possibilities I realized that making it 3D was not the best idea for my billboard so I've decided to keep it 2D for safety reasons.