“…Currently, most existing and potential V2V communication services involve notifying drivers of an increased risk of collision with another vehicle when changing position or speed (e.g., intersection movement assist [3], [4], [5], [6]). However, in actual traffic environments, drivers often use multiple modalities (e.g., gestures, headlight flashing, and horns) to warn other drivers while negotiating a potentially risky maneuver [7], [8].…”