Was there any law against metric road signs before the 1970s? asks Kel
On the M3 today I saw the familiar ‘No hard shoulder for 2000 yards’.It’s clear that it really represents 2000 m, which made me think about the fact that metric is prohibited on our road signs. This does not include height and width restrictions of course and there were signs that gave the lane width (there were roadworks) of 2.0 m and 6′ 6″. Can anyone tell me when metric became prohibited on road signs? I would have thought that there was simply no law on it as there would not have been the need prior to metrication in the 60’s/70’s.
Further to this, when did they become allowed for height and width restrictions (alongside imperial) and when did weight restrictions convert to metric, ie. tonnes on mgw signs?
Perhaps metric was always prohibited or did someone make it so to halt the progress of metrication?
Can somebody supply a short history of how this mess came about?