Maxspeed and Road Tagging
Analysis on the tagging of maxspeed on roads, highlighting the ease of adding roads, challenges faced without signage, and implications of legislative changes on mapping unsigned speed limits. The visual content depicts the process and intricacies involved in mapping road speed limits.
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Presentation Transcript
What percentage of roads have maxspeed tagged?
What percentage of roads have maxspeed tagged? 15 %
But why? 1. Adding roads is easier vs Images Sources: https://wiki.openstreetmap.org/wiki/File:Bajrabarahi_Nepal_mapping_training.jp g https://wiki.openstreetmap.org/wiki/File:Surveying_with_walking_papers.jpg
But why? 1. Adding roads is easier 2. No sign, what to tag? Images Source: https://commons.wikimedia.org/wiki/File:Portsmouth_Road,_Long_Ditton_- _geograph.org.uk_-_2148542.jpg
maxspeed=90 80 When the legislation changed but you mapped all unsigned speed limits with maxspeed
maxspeed=80 source:maxspeed=FR:rural
maxspeed=80 source:maxspeed=FR:rural 1:1 maxspeed=80
(maxspeed=80) source:maxspeed=FR:rural 1:1 maxspeed=80
maxspeed=80 source:maxspeed maxspeed:type
maxspeed=80 source:maxspeed maxspeed:type zone:maxspeed
maxspeed=80 source:maxspeed maxspeed:type zone:maxspeed zone:traffic
maxspeed=FR:rural source:maxspeed maxspeed:type zone:maxspeed zone:traffic
maxspeed source:maxspeed =FR:rural maxspeed:type zone:maxspeed zone:traffic
Sounds good, doesnt work Mappers still need to know in which road category they are to make any contribution at all
Sounds good, doesnt work Mappers still need to know in which road category they are to make any contribution at all Those road categories need to be defined comprehensively and mappers need to know about them (for each country) But they aren t (it s not always just urban/rural)
Default Speed Limits wiki.osm.org/wiki/Default_speed_limits
Findings source:maxspeed (etc.) schema is only good to determine if it is signed, urban or rural (But: it is only set if no explicit maxspeed is specified )
Findings source:maxspeed (etc.) schema is only good to determine if it is signed, urban or rural (But: it is only set if no explicit maxspeed is specified ) Many road types can be determined from physical properties or their classification in OSM with certainty. A plethora of more tags are used in different countries
Demo!! westnordost.github.io/osm-legal-default-speeds/
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