Flying light being chased by a helicopter over Interstate 5 Chula Vista California 30 March 2015 10:20 PM

While driving home from work I was traveling on I-5 in the south bound direction, shortly after passing under the 54 freeway overpass, I noticed to the left of me on the eastern side of I-5 a bright light traveling Northern direction but coming towards me,  I then noticed another light following the first light but not quite as bright, it appeared to me at first that it might be two fighter jets doing maneuvers, the first light then quickly turned West crossing I-5 at a very high rated of speed I'm guessing about 250 to 300 Mph quickly pulling away from the second light.  
When the second light passed in front of me I noticed it to be a helicopter, I know this because I work with helicopters and it had the distinctive shape of a helicopter red light on the top of the tail and I could see that the tail rotor was enclosed in the tail pylon.  I believed the helicopter was chasing the light because when the light quickly turned south over the bay and disappeared the helicopter turned north and broke off the chase.  I could not make out any shape to the first light it just looked like a very bright light moving at a very high rate of speed, and because I'm a military veteran I've seen many types of aircraft at night and I have always been able to make out their shapes, such as a helicopter, passenger air plane or fighter jet.  
I could not make out any shape at all around this speeding light so I can only believe that I was some special military project or something unknown to me.