The 70-mile-per-hour speed limit signs for semitrucks that came down across Idaho last month have already been recycled, but their removal highlights how responsibility for road signs is divided between the state and local governments.WATCH How Nampa and ITD divide responsibility for signs along state highways Nampa and ITD divide responsibility for signs along state highwaysWithin Nampa, State Highways 45 and 55 pass through the city, along wit…