  We present a novel approach to automatically identify driver behaviors from
vehicle trajectories and use them for safe navigation of autonomous vehicles.
We propose a novel set of features that can be easily extracted from car
trajectories. We derive a data-driven mapping between these features and six
driver behaviors using an elaborate web-based user study. We also compute a
summarized score indicating a level of awareness that is needed while driving
next to other vehicles. We also incorporate our algorithm into a vehicle
navigation simulation system and demonstrate its benefits in terms of safer
real-time navigation, while driving next to aggressive or dangerous drivers.
