I hit a deer with my car and pulled over to emergency lane. I had a hard time to make the car stop rolling. I pressed brake, emergency brake, car was stuck in neutral. I thought car was stopped and got of car . Car began rolling and i was holding onto passenger door handle and I could not open door to jump in and stop car. I had to let it go and it went into the lane on the highway and stop finally.. Luckily no one hit the car or got hurt. I had to stay seated in the car with my foot on brake with a cop behind me until a tow truck arrived. Car would not start, park or anything.