I was downloading a song to my phone and then proceeded to patrol the highway . Played the music and was getting into it when I noticed an object fly low at a high rate of speed . My initial reaction was to contact dispatch and let them know an aircraft was flying low. I then thought it was prob just a bottle rocket but it couldn't have because it had a straight flight pattern. I then pulled up next to the other officer on shift and she asked if I saw the same thing .