Italian road sign: motorway location marker (type A). The number on white plate represents the km of the motorway where the sign is placed while in the green plate is shown the name and the distance to a motorway exit/rest area/parkign area. This model is used on motorway having the median of at least 3 m width. The destination is choosen with the according to the last digit of the number on the white plate:
if the digit is 1,2,4,6,8,9 is shown the name of the next exit
if the digit is 3,5,7 is shown the name of the next rest area/parking area
if the digit is 0 is shown the name ot the next regional capital (or the end of the motorway)
Picture 95 of ministerial circular n. 9540 of 1969, used until 1992.
Circolare Ministero dei Lavori Pubblici n. 9540 del 20 dicembre 1969 "Segnaletica autostradale"
Original:  Ministero dei Lavori Pubblici

Vectorization:  Earthshaker13