Craft was flying around 200 ft off ground on the north side of highway 5

I was driving on the southbound lane heading towards LA on the 5 and witnessed to my left a chevron shaped craft the size of a Boeing 747 hovering about 1000 feet off the ground with around 10 bright lights on it. It banked to the left, cut the lights, and it became clear that the craft was non reflective and seemingly black in color. It then dove towards the ground over a field, righted itself so it was parallel to the ground at around 50 ft off the ground and flew for around 1000 feet then lifted up and sped away disappearing. None of the plants or crops seemed to be blowing or effected by the craft. It was much more agile that a regular plane and due to its size surprising that if it was military it would be allowed to cut its lights as well as fly that low by a highway. Many other cars seemingly reacted to it as well but I did not stop to chat with anyone as there were no immediate exits.