A.k.a. DIN-Schrift, as defined by the German industry standard committee in 1931 (confirmed in 1936), under the supervision of Ludwig Goller. Used most prominently for German traffic signs, postmarks, and, until 1994, for number plates. Spans three widths: Mittelschrift, the condensed Engschrift (based on the standard lettering model by the Prussian Railways), and the expanded Breitschrift.
The digital fonts available from Linotype, URW++ and Elsner+Flake are based on a revised standard sheet from 1980, drawn by Adolf Gropp.