It was snowing and an icy day Jan. 21 in Atlanta, Georgia. I was driving on Buford Spring Connector going southbound. I was on a bridge and it was completely white and icy. I saw there was a car stopped in front of me. I tried to put on my breaks and my car would not slow down. I was getting closer to the other vehicle still trying to break. I tried to use my electronic emergency brake and it did not engage. The car did not even try to break for me which it normally ds if I moving faster than a stopped car in front of me. I rear ended the person in front of me. I just wanted to let someone know as the forward collision did not work in this case and the accident could have been avoided.