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This paper addresses the problem of generating 3D object proposals given a stereo image pair from an autonomous driving vehicle. The paper proposes a set of features for a 3D cuboid over a point cloud and ground plane derived from the stereo image pair. The features include point cloud density, free space, object height prior, and object height relative to its surroundings. Note that the features are dependant on knowledge of the object class (other "objectness" proposal methods are agnostic to the object class). A structural SVM is trained to predict the "objectness" of the 3D cuboid proposal.