Idaho joins Washington and Colorado DOTs in replacing Mile 420 markers

Updated Aug 28, 2015

Milepost 420 isn’t exactly a common sign in America. Most states don’t even have roads that reach 420 miles in length, but for those that do, the signs have become a target for fans of marijuana.

According to the Spokesman ReviewIdaho just joined Washington and Colorado in replacing the signs with one that’s not featuring the number that’s long been associated with cannabis culture. However, the new 419.9 signs are no less unique in America.

“It was a decision we made based on what was happening,” Idaho Transportation Department spokesman Adam Rush said.

Idaho has replaced two milepost 420 signs, while Colorado changed its only milepost 420 sign along Interstate 70. And the Colorado DOT says it’s done its job in dissuading the theft.

“It seems to be working,” Colorado Department of Transportation spokeswoman Amy Ford said. “We’re very pleased.”

Washington replaced one of its two 420 signs three years ago, but the other sign at U.S. Highway 12 has yet to be replaced with 419.9. Although, the 420 milepost that should be there is missing after yet another theft.

One of the other states with a milepost 420 sign, Montana, may not have been stolen recently but it was near the location of one of the biggest pot busts in state history, with an officer finding a car with 115 pounds of marijuana.