You are sharing the road. So if your car does something stupid that gets me killed you cannot claim that "hey bro, i'm just testing it". Also, I am not sure that you are qualified to test a car and not sure that legally you are allowed to test things on public roads.
I accept all liability and my insurance is happy to accept my payments. If I don't pay attention and kill you it's my fault. Just like if I drink and drive.
