The planet_roads table contains a subset of planet_lines to allow display of roads to minimize database look ups at zoomed out levels
In many countries, the Ferry Routes are part of the highway system forming Nautical Highways and are often consider as part of the trunk or primary road system, as well as local ferries.
Adding the following tags to planet_roads will allow the display of Nautical Highways that use Ferries to connect Islands.
The planet_roads table contains a subset of planet_lines to allow display of roads to minimize database look ups at zoomed out levels
In many countries, the Ferry Routes are part of the highway system forming Nautical Highways and are often consider as part of the trunk or primary road system, as well as local ferries.
Adding the following tags to planet_roads will allow the display of Nautical Highways that use Ferries to connect Islands.
route=ferry ferry= name= ref=*
(http://wiki.openstreetmap.org/wiki/Tag:route=ferry)