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highwayToFerryTagCheck.md

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HighwayToFerryTagCheck

Description

The purpose of this check is to flag all Edges with route=FERRY and highway=PATH (or higher). According to OSM Wiki, when route=FERRY exists for an object, its ferry Tag can take values of highway classification and so, it is recommended to have a ferry Tag with the highway Tag value instead of a highway Tag for ferry routes.

Live Examples

  1. The OSM Way 25957980, ingested as an Edge, has route=FERRY, ferry=YES and highway=TERTIARY Tags. The ferry Tag should have the value of the highway classification instead of the additional highway Tag.

  2. The OSM Way 256442950, ingested as an Edge, has route=FERRY and highway=TERTIARY Tags. Since this is a ferry route, the Tag should be ferry=TERTIARY and not highway=TERTIARY.

Code Review

In Atlas, OSM elements are represented as Points, Lines, Edges, Areas and Relations. In our case, we're looking at edges. The incoming Atlas object must meet the following criteria to be considered for flagging:

  • Has to be a Main Edge and its OSM id should not have already been flagged
  • Has a route=FERRY Tag
  • Has a highway Tag with priority greater than or equal to a minimum highway type. The default minimum highway type is PATH which includes MOTORWAY, MOTORWAY_LINK, TRUNK,TRUNK_LINK, PRIMARY, PRIMARY_LINK, SECONDARY, SECONDARY_LINK, TERTIARY, TERTIARY_LINK, UNCLASSIFIED, RESIDENTIAL, SERVICE, TRACK, LIVING_STREET, PEDESTRIAN, BUS_GUIDEWAY, RACEWAY, ROAD, CYCLEWAY, FOOTWAY, BRIDLEWAY, STEPS and PATH. The minimum highway type is set as a configurable so that the default minimum type can be overridden.

The object is then flagged with appropriate instructions based on the following conditions:

  • If the object has a Ferry Tag and is not of the same classification as the Highway Tag
  • If the object has a Ferry Tag and is of the same classification as the Highway Tag
  • If the object has no Ferry Tag
More Information

For more information, see the source code in HighwayToFerryTagCheck.