Some tips for using a Mercedes backup camera are to use the white guidelines for the width of the car and to use the yellow hash marks and red dots to ascertain the direction of the car. There are also colored lines to judge distances.
The camera's white guideline shows the width of the vehicle from side mirror to side mirror. Yellow horizontal lane markings show the expected path of the tires. If the steering wheel turns, red dots appear showing the changing direction of the vehicle.
The 2014 CLA250 also has a red horizontal guideline which indicates a space of 10 inches from the bumper to ensure a safety zone. There are also yellow lines that show distance, one of 3 feet and one of 13 feet.