Colorado Replaces Mile Marker 420 With 419.99 To Thwart Thieving Stoners.
Colorado officials think a difference of one-hundredth of a mile will be enough to stop thieves from stealing the mile marker 420 sign along Interstate 70.
Amy Ford of the Colorado Department of Transportation says the "MILE 420" sign near Stratton was stolen for the last time sometime in the last year, and officials replaced it with a sign that says "MILE 419.99."
Direct Link to SV historical imagery.
Here's another Colorado Mile Marker on I-70 that got the same treatment: http://goo.gl/maps/Qx728