Triangle shape UFO spotted near Vegas

Driving down highway 15 southbound over by Las Vegas speedway and there was a triangle Black Craft. It had a white beaming light coming out the front of it. Then it turned it off and turned on a red light. it also had a smaller green light on one of the tips of the triangle. I tried to pull over and get a better look but there was too much traffic it flew right over my vehicle on the highway it was hovering over the interstate. Another vehicle pulled over to get a good look at it too