Who came up with the idea of putting the white line on the right side of roads?

Over fifty years ago, L. O. Gray requested that the road department in his county in northern California put white lines on the sides of the roads for safety. On curvy, mountainous roads the edges were hard to see at night or during snow storms. Having that line there allowed drivers to see where they were in relation to the rest of the highway when all was blocked out by glare, snow, and/or darkness.