Posted October 11, 2015
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As much as it seems like it would be a problem, at the same time it wouldn't. If you change your address, the DMV in some states issues you a sticker you replace the bottom of your driver's license. To the same effect, printing weather resistant labels and replacing the markers with appropriate changes would be less costly; Probably some cities would actually get the full work done and other sections get patches. After which you keep working your way out until everything gets converted. Probably take a few years...
The speedometers in cars would be more annoying to change over... Most likely for speed signs you'd add the new speed sign, leave the old one up for a couple years, then remove the old one when everyone's switched over...