Acestea nu actioneaza independent ci doar insotesc indicatoarele rutiere, dand astfel acestora informatii suplimentare privind distante si lungimi, directii de actiune a indicatoarelor, informatii asupra unor categorii de autovehicule, arata situatile in care drumul prioritar i-si schimba directia de mers, cazuri in care se excepteaza anumite categorii de autovehicule, panouri aditionale de inceput, sfarsit si confirmare, panouri aditionale care indica directia de urmat la semafoare.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.

.