advice advising alert automobiles black cars closed communicate communication dead-end end information informing lettering letters limited limited-access message motor-vehicles no-thoroughfare no-through-road restricted restriction restrictions road roadway safety sign vehicles warning white wording words background cliffs grass gravel HDR hills mountain Nyberg path rock rocks scene scenery scenic stone stones street summer tracks tree way forest green hill landscape madeira natural nature trees valley wind winding authority availability available blue checkered checks communicating law mobile mobility motor-bike motor-cycle on-duty order police police-only power regulations responsibility responsible road-work security signs symbols transport transportation travel vehicle cold dry fall leaves maple wood yellow Adirondack snow winter bush car country dusk lights night rural Australia bridge Murwillumbah river tweed Uki freeway highway hwy NSW tunnel