Hwy 40 west 3 to 5 miles w of hot sulphur springs co. late morning september 13 , 2017. near mm 200 looking at the high canyon walls while driving while my wife snapped photos, very odd moving slow , then hovered. black in color, long rectangular shape almost cigar with a faint glimmer around the edges moving like a flowing vapor i could only view 2 seconds at a time while driving, asking my wife to look and where to look.She snapped a dozen pictures during the event without ever seeing. puzzled , wished my wife could have seen , unable to get to a safe place as this is a dangerous stretch with the colorado river below , jagged cliff rock on the other. lost sight with switch back curves. returned home downloaded onto computer . found my wife never saw , however 6 photos had the object in the frames.