1. A method comprising: measuring movement of a target vehicle in proximity to a host vehicle; assessing a pattern of the movement of the target vehicle relative to the host vehicle or a third vehicle; generating, via a processor, a classification by classifying the movement of the target vehicle as: erratic if the pattern represents a first deviation from a typical vehicle movement; and aggressive if the pattern represents a second deviation from the typical vehicle movement, the second deviation being greater than the first deviation; and taking action based on the classification.