It usually means U were speeding, while crossing a signal.
U can go to the Traffic dept at Airport or Madina Khalifa and they will explain what the violation was, including showing you the picture and the speed at which U were driving. And trust me, the time quoted on the violation can play tricks on ur mind. Once U check the movie/picture, U will be surprised to see ur car and the exact time. Been there, done that.. :)