Good question! So by default this camera will show ALL vehicles passing whether a plate was detected on that vehicle or not. The camera also does not have the ability to determine plate color, so every plate that is detected is registered as blue. So we're simply just using the blue filter to only show detections with plates, rather than every vehicle. There is also a way inside the camera settings to enable it so the Specialist only detects plates as we which is listed in our guide on this camera at www.getscw.com/the-specialist-lpr-camera under the download tab. Feel free to reach out to us with any other questions!