Preferred interstate mainline sign assembly in your state

[peterj920]

Wisconsin's preferred interstate sign assembly is a unisign with a neutered shield that is 4.5 feet high and 3 feet wide for 2 digit signs on a wooden post or on a light pole in urban settings.  For 3 digit signs, they are 4.5 feet high by 4 feet wide on a unisign.  What is your state's preferred interstate sign assembly?  Provide pictures if possible