Abstract: Presented here is an apparatus and a method for measuring effectiveness of images displayed on a moving object. For example, the moving object can be a vehicle with a frame mounted on the rooftop. The frame can have one or more display screens mounted on one or more sides, showing various images. The vehicle can be a part of a fleet of vehicles in communication with each other. A camera can be mounted close to the display screen and can record images of the surrounding environment. An embedded system within the vehicle can analyze the recorded images to determine a total number of people having a line of sight to the displayed image, and a total number of people looking at the displayed image. Based on the analysis, the embedded system can determine the effectiveness of the displayed image.