It's an interesting design, but I find myself wondering how often license-plate forgery happened.
> The motivation for the creation of the typeface was spun in the late 1970s in the light of Red Army Faction terrorism
Given the amount of money spent on vehicle licensing, the additional work to create a font is small potatoes. It certainly doesn't cost more to produce.
It's analogous to choosing between TAI and UTC time in a system. They differ by only 36 seconds, but UTC clocks break during leap seconds. Why not just choose the right one.
Whilst the DIN typeface was using a proportional font,
the FE-Schrift is a monospaced font (with different
spacing for letters and numbers) for improved machine
readability.
When you think about it, although the stamps are not that hard to fake, stealing a number plate is a matter of a second. You just clip it out of a plastic frame.
Source: My number plate was stolen in Germany last year.