I came across theet of sign, which, although completely metric, bothered me ever so slightly.
Firstly, the use of 'T' rather than 't' for tonnes. Something that needs to be corrected on UK weight limit signs in general.
The lower sign, however, gives a figure of 4425, which we can only reasonable assume to be millimetres. (You can't be sure because the units aren't specified. Maybe it's just a random number?)
Such signs give an impression that metric units are complicated when, in fact, they are much simpler than the alternative.
But the use of the appropriate scale is paramount. 4.4 m would be a much more appropriate for this sign.