They claim MILES of visibility. Testing shows you can drive up to within less than 1/4 mile before they are even noticed at night. Often about 100 ft. A car going 60 mph covers 88 ft per second! Add in reaction time and braking distance and by the time someone sees you they are far beyond your position! I like them, but they should be forthcoming about the visibility. if they have some actual testing videos, I would like to see them and it might change my mind