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<h1>Road <img src="http://wiki.thinkgeo.com/wiki/_media/waterway_vector_polyline.png?w=18&h=18&t=1546849171&tok=3dadf9" /></h1>
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{{:road.png}}

==== Zoom Level Applied: 4~19 ====
The road(highway) is directly derived from the OSM highway hierarchy. It's the most complicated ones in Map Suite World Streets. The type of road is column "class".Some road has a column called 'oneway', which is used to access restriction on the roads as appropriate(when the way can only be used in one direction).
Some road examples: motorway, secondary, track, motorway_link, cycleway, etc. See more examples below.

===== Columns =====
==== geometry field ====
''shape'' type : line

==== class ====
The main field used for styling is ''class''.
the class attribute is the value of the OSM road "highway" tag's value, which helps indicate any kind of road, streets or path.


^Value	                ^Description^
|'' 'motorway'	      ''  |A restricted access major divided highway, usually with 2 or more running path and plus a emergency hard shoulder.|
|'' 'motorway_link'	  ''  |The link roads (sliproads/ramps) leading to/from a motorway from/to a motorway or lower class highway. Normally with the same motorway restrictions.|
|'' 'trunk'	          ''  |A very important roads in a country's transportation system.|
|'' 'trunk_link'	  ''  |The link roads (sliproads/ramps) leading to/from a trunk road from/to a trunk road or lower class highway.|
|'' 'primary'	      ''  |Less important than 'trunk', but also very important in a country's transportation system which is usually link larger towns.|
|'' 'primary_link'	  ''  |The link roads (sliproads/ramps) leading to/from a primary road from/to a primary road or lower class highway.|
|'' 'secondary'	      ''  |The next important roads in a country's system which is usually link towns.|
|'' 'secondary_link'  ''  |The link roads (sliproads/ramps) leading to/from a secondary road from/to a secondary road or lower class highway.|
|'' 'tertiary'	      ''  |Usually link smaller towns and villages.|
|'' 'tertiary_link'	  ''  |The link roads (sliproads/ramps) leading to/from a tertiary road from/to a tertiary road or lower class highway.|
|'' 'street'	  ''  |This tag includes the 'unclassified','residential'and 'living_street'.'' 'unclassifiled' '': Usually be used for roads used for local traffic, and for connecting other towns, villages or hamlets. '' 'residential' '':Roads often lead to housing and lined with housing. '' 'living_street'' ':The residential streets that pedestrians have legal right over cars, low speed and children are allowed to play on the street.|
|'' 'service'	      ''  |Be used in conjunction to indicate the type of usage ,who can use it and in what circumstances.|
|'' 'pedestrian'	  ''  |Mainly used for pedestrians in shopping and some of them allow access by motorised vehicles only for very limited periods of a day.|
|'' 'track'	          ''  |This tag represents roads for mostly agricultural use, forest tracks etc.; usually unpaved (unsealed) but may apply to paved tracks as well, that are suitable for two-track vehicles, such as tractors or jeeps.|
|'' 'raceway'	      ''  |A course or track for (motor) racing|
|'' 'road'	          ''  |An unknown type of road.|
|'' 'footway'	      ''  |For designated footpaths; i.e., mainly/exclusively for pedestrians. This includes walking tracks and gravel paths.|
|'' 'bridleway'	      ''  |For horses.|
|'' 'steps'	          ''  |For flights of steps (stairs) on footways.|
|'' 'path'	          ''  |A non-specific path.|
|'' 'cycleway'	      ''  |For designated cycleways.|
|'' 'construction'	  ''  |For roads under construction.|
|'' 'aerialway'	  ''  |This tag includes '' 'cable_car' '','' 'gondola' '','' 'chair_lift' '','' 'drag_lift' '','' 't-bar' '','' 'j-bar' '','' 'platter' '','' 'rope_tow' ''.|
|'' 'railway'	  ''  |The railway tag is used to tag the ways for many kinds of railways including including light rail, mainline railways, metros, monorails and trams. Besides the actual rails, it is also used for tagging railway infrastructure.|
|'' 'aeroway'	  ''  |The aeroway key is used to tag physical infrastructure used to support aircraft, air travel, spacecraft and space flight, in particular the elements associated with airports, spaceports and heliports etc.|
|'' 'ferry'	          ''  |This tag represents ferry service on a ferry route or at a transport stop.|

==== type ====
''type'' is the type of the road. The value is used to identify the roads in the same ''class''.
==== name ====
''name'' is the name of the road.
==== ref ====
''ref'' stands for "reference" and is used for reference number or codes for the roads.

==== oneway ====
A column of road, mark with "1" or "0" to indicate whether the motor traffic on the road is ''oneway'' or not. If the road is ''oneway'', traffic travels in the same direction as the linestring.

==== structure ====
''structure'': Indicates if the roads are the '' 'tunnel' '', '' 'bridge' '','' 'toll' ''. It is an enumerable values.

1 -- normal

2 -- bridge

4 -- tunnel

8 -- ford

16 -- toll way

==== layer ====
''layer'': the values range from '1' to '26' . It is usually related to drawing priorities. Usually the roads with the larger value of layer will be drawn first.
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