Drivers may not be getting any brighter, but cars are. The latest wrinkle in traffic safety is the running light.
A running light is a 21-candlepower light, attached to the grille, that turns on with the ignition. The resulting gleam warns of a car's approach not only at dawn and dusk, when headlights may be off, but also in broad daylight, when the car is in a shadow or blending with the background. Running lights were first used by Greyhound buses, which experimented in 1960 by leaving their headlights on in daylight....
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