The model: The marker board: who, when, how big?

On the passenger car a marker board is never required; on the trailer it is — if the load protrudes more than 10 cm at a side or more than 1 m at the rear (Book p.229). The legal minimum is a square board of 0.42 x 0.42 m, red-white diagonally striped and retroreflective. At night: white light at the front, red light at the rear.