I was driving along slaughter lane heading south towards manchaca in austin, texas. from the south i noticed out of the corner of my eye some flashing lights. they slowly moved across my view flashing in regular intervals. the lights appeared to be in a triangular formation. they moved out of my sight heading north, northeast. at one point it appeared to me that the lights split up. i do have a video of the lights from my car camera. i wanted to stop and observe more but the traffic was too heavy and i wanted to avoid an accident. by the time i could see anything they were gone. i cannot upload the video from my home. we do not have internet access but i would like to provide you a copy.