郡道
County highway markers are usually a yellow-on-blue pentagon (the Manual on Uniform Traffic Control Devices standard pattern), a black-on-white rectangle, or black text on a white rectangle (largely older signs). Some states, like Virginia and North Carolina, have no county highways in most of their counties; the state government maintains all roads in unincorporated areas. In West Virginia, the state maintains secondary roads but they are designed as county routes. Other states, like Connecticut, have no county routes because there is no government at the county level. Alaska's county-equivalent boroughs maintain roads in unincorporated areas but none are numbered; Louisiana's county equivalents are parishes, and, accordingly, have parish routes.