|highway = tertiary|
- name=名稱 - 道路名稱。例如：「中山路」「 Zhongshan Road」
- maxspeed=數字 - 道路法定最高限速（公里每小時）。例如：「50」
- minspeed=數字 - 表示行駛道路必須達到的最低限速
- ref=編制名稱 - 道路的編制號碼。例如「花15」、「HL15」
- loc_name=名稱 - 非官方或地方道路名稱
- maxweight=數字 - 最大載重限制（噸）。例如「5.5」
- surface=* - 道路路面材質說明。例如「asphalt（柏油）」
- width=數字 或 est_width=數字 - 道路寬度（公尺）。例如「6」
- lanes=數字 - 道路可使用的車道數，常為「1」或「2」。若對向車輛通過不需減速，即使無中央分隔線，仍為「2」。
|Australia||Other roads linking towns, villages and Points of Interest to each other and the secondary network. In South Australia, roads that are classified as a 'D' route under the Alphanumeric system use this classification.||Australian Roads Tagging|
|Greece||Unclassified roads that connect towns, villages and points of interest to each other and classified roads.||WikiProject Greece § Road Network|
|El Salvador||Roads whose traffic intensity is between one hundred and five hundred average vehicles per day, have six meter platforms, and are coated with selected local materials and a minimum span of six meters, fifty centimeters on bridges.|
|UK||There is a corresponding official alphabetic classification matching OSM's "tertiary" tag fairly well: 'C' roads. Note that this official designation is rarely seen on signs. For the purposes of mapping, it's normally best to tag distributor roads according to their relative importance in the road hierarchy, as described above.
One rule of thumb for UK roads is that highway=tertiary works well for roads wider than 4 metres (13') in width, and for faster or wider minor roads that aren't 'A' or 'B' roads. In the UK, they tend to have dashed lines down the middle, whereas unclassified roads don't.
Always consider the road in its context too. Where it makes sense to do so, favour keeping the classification continuous on the map over strict adherence to physical criteria.
|United Kingdom Tagging Guidelines#UK roads|
- The 'C' road classification is rarely publicized and frequently only used by local authorities, for maintenance and planning purposes. In England, responsibility for designating 'C' roads is usually vested in the county councils, each of which decides upon its own numbering system. A 'C' road crossing a county boundary will probably undergo a number change and may cease to be a 'C' road altogether. For more information, see Chris's British Road Directory: The Great C-Road Hunt