Colorado has changed it's 420 mile marker sign after it continues to be stolen since the legalization of recreational use of marijuana in the state.  I imagine the sign was stolen plenty even before the legalization, however, it's now being replaced almost daily. To combat thievery, officials in Colorado have come up with a new idea for the mile marker.

The sign has been moved about 50 feet and now reads "419.99", and will likely be stolen just as much, if not more. Colorado has also replaced mile marker 69 with "68.5" and seem to be having some luck with that.