Oil!

The road ran, smooth and flawless, precisely fourteen feet wide, the edges trimmed as if by shears, a ribbon of grey concrete, rolled out over the valley by a giant hand. The ground went in long waves, a slow ascent and then a sudden dip; you climbed, and went swiftly over—but you had no fear, for you knew the magic ribbon would be there, clear of obstructions, unmarred by bump or scar, waiting the passage of inflated rubber wheels revolving seven times a second. The cold wind of morning whistled by, a storm of motion, a humming and roaring with ever-shifting overtones; but you sat snug behind a tilted wind-shield, which slid the gale up over your head. Sometimes you liked to put your hand up, and feel the cold impact; sometimes you would peer around the side of the shield, and let the torrent hit your forehead, and toss your hair about. But for the most part you sat silent and dignified—because that was Dad’s way, and Dad’s way constituted the ethics of motoring.