10:40 am over San Bernardino valley, very bright light for an instant, then again seen further east and moving west then vanishedI was driving on Hwy 18, east from Lake Arrowhead to Running Springs, along the "Rim of the World". It wa clear and sunny, except for high cirrus.I topped at a turnout to take a photo of geo-engineered clouds, facing South. When I began to drive East, I saw a very bright light flash in front of the clouds toward the south. It was very small, but very bright white, brighter than a sun reflection off an airplane. It was gone in an instant. I stopped and looked, but could see no movement or airplane in the area.I continued my drive for approx. 1 mile, stopped at another turnout on the north side of the hwy, and took another photo toward the North.I then continued East on Hwy 18 when I saw another flash like the first. This one was further east than the first. I stopped in a turnout, and got out of the car. I saw the bright light, then it faded to a black as it moved west, then a smaller flash and then it was just gone. I looked at the area to see if it was an airplane between me and the clouds, but there was absolutely no movement of anything, and no more of the bright light.I was alone but I saw that two people who had been traveling west on Hwy 18 had pulled over on the south side of the highway and were looking in the same direction.I have lived here all of my life, and know what an airplane looks like from the Rim. This was far brighter than anything I have ever seen. It must have been pretty far away from me, but it was in front of the clouds.((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. PD))