Any use of force is capable of killing you, shot, tazed, hit in the face (this qualifies as deadly force where I'm from). In our DT class at the prison I use to work at they told us a story regarding use of force. An offender was being noisy and disruptive in a courtroom so the judge instructed the officers in charge of him to take him outside and "shut him up". They took him outside and struck him in the common peroneal nerve multiple times. This is not typically considered to be deadly force however they struck him one too many times and he ended up dieing. Was the use of force justified? Maybe not but the courts ended up deciding it in fact was, was it excessive? maybe but the courts decided that given the offenders behavior in court and that it was not typically deadly force that it was not excessive. There is a lot a police officer can do that is justified and not excessive that could easily kill you even if nothing is wrong with you health wise. The officer may not even intend to but you'll be just as dead and your family (as well as him and his family believe it or not) will be upset over your death. So moral of the story its probably not a good idea to get out of the car without the officer telling you to. A well experienced officer you'll be ok, you might get a gun pulled on you or backup may show up but you'll be ok. A new officer or one who isn't so good at his job.... you might not be so ok.