Craft was dark grey/gun metal, both small & large lights on under belly no sound. Moving along the Southfied Freeway

At the time I was a teacher at the jr. h. sch located on the freeway service drive.  I was driving a student home who was assisting me with the Sat. chores The machine was moving slowly and then seemed to stop and hover the freeway.  While it was hovering, the lights flashed on and off.  I pulled my car over so I and the passenger could observe.  When it started moving slowly again, I rushed home to see if I could find another adult witness.  I wanted you to know that what is being observed now is by no means a new phenomenon