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Deleted member 26715
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The French made a similar blanket change a couple of years ago. They managed to cope.
With all due respect that means nothing without context, were all road signs changed overnight, were signs changed gradually over a period, are all roads 20 with no option of 30, if there are 20's & 30's were all prosecutions suspended until all roads had 20 signs. How long was the public information out there before they made the change?