Vehicle classification has crop up as an important area of study due of its importance in variety of applications like surveillance, security framework, traffic congestion avoidance and accidents prevention etc. The image sequences for traffic scenes are recorded by a stationary NI smart camera. The video clip is processed in LabVIEW to detect vehicles in images and measure characteristics like width, length, area, perimeter using image processing feature extraction techniques. The extracted vehicle features from the traffic video are used to build a cluster model with two clusters - big and small in WEKA toolbox. The cluster model implements k-means clustering technique of data mining. The cluster model is used to classify new vehicles instances as big or small based on the vehicle features in images.