2:00PM Green ball of light that was about the size of a softball 15 ft above highway that passed us at a couple hundred miles an hour.

A friend of mine,his wife and I were driving NW at 34th Street on Route 290 (NW Freeway) in Houston about 2:00pm in the afternoon. It was a bright sunny day. We were driving in medium traffic on the six lane highway (3 each way)  when a bright glowing green ball of light flew past our van and continued along above the highway at about fifteen feet above the roadway. When it got to the overpass down the road from it, it continued to follow the conture of the road staying the same height above the road. We could see it continue on past the "hump" of the overpass (actually we could not see it go down the back side of the hump) but it continued on and came back into view and continued out of sight. The driver and myself saw this object as about the size of a softball. As it passed the van we were in it was no more  than a few feet from the side of the van. I was on my knees bwtween the two front seats. The drivers wife however, said the green ball seemed to be about the size of a basketball and about fifty feet  off the road. The lady driving the car that was beside us waved here arms franticly at us pointing, like, "did you see that?" We nodded yes and kept driving. It seemed to be going a couple hundred miles an hour. it was gone in a few seconds. The green ball was very bright, glowing emerald green light, quite visable in the bright sunny day.
Date is approximate.  PD