Sign of the times: 'Mile 420' highway markers are hot item

Dude, where’s milepost 420? You won’t find it in Washington anymore. Idaho either.

Why Colorado Once Had to Replace a Road Sign That Read 420 - Knowledge Stew

Amy Ford's Instagram, Twitter & Facebook on IDCrawl

Answer Man: Why does MoDOT use so many mile-marker signs?

Roadside attractions: 50 things to do when traveling State Road 50 – Orlando Sentinel

419.99 Mile Marker – Stratton, Colorado - Atlas Obscura

Products – Vintage Vibes 420

Idaho Thwarts Stoners by Removing 420 Highway Signs

419.99 Mile Marker – Stratton, Colorado - Atlas Obscura

This mile marker. : r/mildlyinfuriating

Highway Forced to Install Mile Marker 68.9 After Thieves Keep Stealing '69' Sign

Homebody Accents Framed Mile Marker 420 6x16 Metal Sign, Rustic, Cannabis, Weed, Hand-Crafted from Reclaimed Materials : Home & Kitchen