420, 4:20, or 4/20 (pronounced four-twenty) is a code-term used primarily in North America that refers to the consumption of cannabis...... smoking and celebrating cannabis on the date April 20 (4/20 in American form).
In Colorado, the Colorado Department of Transportation replaced the frequently stolen Mile Marker 420 sign on I-70 east of Denver with one reading 419.99 in an attempt to stop the thievery.
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