State highway sign 4 State highway sign 4 Illustration of state highway sign mapping, navigation, state, highway, sign, roadtrip, route, travel, four, digit, quadruple, numbers 2005-03-02 image/svg+xml State highway sign 4 2005-03-02 Integration and Application Network https://ian.umces.edu/media-library/state-highway-sign-4/ https://ian.umces.edu/media-library/state-highway-sign-4/ en-US mapping, navigation, state, highway, sign, roadtrip, route, travel, four, digit, quadruple, numbers Illustration of state highway sign