The ability to see in what is otherwise darkness is part of the symbol’s meaning. Darkness connects with shadow and things disowned, rejected, or feared, and headlights allow you to move through your life despite such psychological obstacles.
The headlights on a car resemble its eyes, and in this way they connect to the ability to “see” in the dark so that further movement on a particular journey can occur. [1]
If the headlights kept moving around, disappearing, or faded/flickered, be prepared to deal with hostile competition. [2]