When you see in the headlights a familiar figure, walking wrapped in a heavy coat. In your excitement you screech to a halt by the sidewalk, jump out of the car and shout her name. She looks back frightened. "Don't be scared, it's just me." and by now she's even more frightened, since the words suggested she might have reason to be, while she did not, as you presumed she would, recognize your voice. So she takes a long look at you and finally gives up on any sort of recognition. Her steps fade on the concrete.
Was she really who you thought she was? Perhaps because you've been driving about for hours, as if expecting to meet someone... steam drifts through the headlights, and now you only hear the engine huffing, one in the night.