But it is being taken literally by some in a state well known for its horse culture.
Helena Police Chief Troy McGee says he's received many calls from residents wanting to know if riding a horse while under the influence is legal. McGee tells the Independent Record newspaper that it is.
Montana law carefully defines a vehicle, and excludes those running under animal power.
The popular 30-second video titled "Sober Friend" shows a savvy horse carefully obeying traffic laws on a nighttime journey through town before stopping in front of a bar to pick up a rider.
