I was carpooling with two other people, heading to school. The morning was completely dark and rainy. I sat in the back of the vehicle. As we pass S. Lane Ave, the driver saw the lights, and pointed them out.At first we all thought it was a plane. I figured it was probably experimental, since it did not have any flashing red, or green. They were just the four solid bright white lights. So then I'm thinking it was coming in for landing, since it made a westward turn. Instead it increased speed, crossing the entire Helena valley in just under two seconds. There were no flashes or cracks indicating a sonic boom. It was as if it just floated out of sight. We were too excited to pull out our phones, even if we did we still wouldn't have had the time. Personally (although I'm open minded), I just want to find out if anyone else saw the thing.