Caution Vehicles Entering Alley Style:Classic Black Frame - 12x12" Frame and after a renovation

and after a renovation

' and on the right is Nomad Clan's 'Fools Gold

Printed on smooth matte 5"x7" paper

The 120 featured a Cummins engine rated at 120hp and shared the heritage of White's 100-series tractors that many considered to be bullet-proof

and he owned and operated a truck stop on US Highway 90 towards the end of Lobo's heyday in the 1950s

Caution Vehicles Entering Alley Style:Classic Black Frame - 12x12" Frame and after a renovationYou'll never see what you don't see on a philosophical level so I always walk the alleys with my camera in hand. So while doing just that, I spotted this 'Caution Vehicles Entering Alley' sign in Denver, Colorado. What kind of a vehicle is a caution vehicle, do you know?