Recently, extensive research concerning driver assistance systems has been conducted. Related applications include lane departure warning, traffic sign recognition, and pedestrian and vehicle detection systems. This paper presents a real-time vehicle detection and tracking system capable of detecting the vehicles in front of a vehicle. The system consists of 2 main steps: generating candidates with respect to a vehicle by using the AdaBoost learning algorithm and verifying the candidates according to symmetry measurement and horizontal and vertical edge analysis. The proposed system is proven to be effective in various traffic scenarios through experiments.