in this different type of vehicles are detected using Haar Cascades .Data is trained using Cascade Trainger Images are downloaded from google using fatkun extension in this a folder is created with subfolders P and N .The number of negative images is to be double to the positive images after the training the data the xml and vector fles are created.Try to download images in grayscale as it removes some of the unwanted substances in the image library used is OpenCV