Which type of route sign is specific to a state?

State Route signs are unique to each state and are used to designate roads that are maintained by the state highway department. They are essential for navigation as they indicate the state’s designated roadways, which may include both rural and urban routes. Each state designs its own State Route signs, which often feature a specific shape and color scheme that differentiates them from other routes.

In contrast, US Route signs are federal designations that indicate highways which may run through multiple states, so they are not specific to one state. County Route signs identify roads that are maintained at the county level and vary from state to state, but they are not representative of state authority. Interstate Route signs refer to highways that are part of the national system of interstate highways, which also span multiple states and are not confined to any one state's system. Therefore, State Route signs represent a direct connection to the specific roadways governed by each individual state, clearly marking their significance within that state's transportation network.