I was driving east bound on highway 78, I had just past under the over pass Rancho Santa Fe. in San Marcos. When I noticed something off to my left in the night sky . The lights were so bite they seemed like car head lights, 4 of them and 1 little red on the left and 1 blue on the rightside then I noticed first that it was very low and if it had been an airplane it was way to low but then I noted that there was no blinking lights as an airplane should be, if that is what it was. Next there was no noise and because I was driving on 78 in the fast lane trying to see this object, but keeping my eye on the road, I also noticed that there was a car in the emergency (inside) lane stopped. I am not sure if they stopped to view this object also or what, but it did look like, as I past the car, that their car looked ok. By this time I was driving under the overpass street of ���Twin Oaks��� and I lost site of the object and couldn���t see it behind me. but i wanted to go back just to make sure it was what I thought it was but i was late picking up my son and boyfriend, I just kept driving asking myself what the Flock was that, what did I just see? and I am still wondering if anyone else saw this too in San Marcos