I followed a link from Wikipedia's article on DIN 1451 to this very broken-looking site containing downloads of public domain traffic signage fonts. They all appear to be so, except one download that I'm not sure about, this German one, which contains DIN 1451. Here's a sample image, metrically kerned. So, is this a commercial version of DIN 1451? Thanks!
(I didn't know if I should plop this here, in Release, or in General. Sorry if this isn't the right one.)