Official catalogue of traffic signs is one of the topics in the Traffic signage block of the Spanish DGT theory. How signage works: types of signs, the order of priority between them and the duty to obey them. Understanding this section well helps you answer the theory-exam questions on this topic with confidence.

In simple terms, this point of the DGT theory establishes that this catalog specifies the shape and meaning of traffic signs, as well as, when applicable, their color, design, dimensions, and placement systems.

The order of priority between signs (officer, traffic light, vertical sign, road marking) is key; many questions are solved just by recalling it.