Records either the speed limit type ('sign','IT:urban' etc) or information about how and when the data was sourced.
The source:maxspeed=* tag is currently used for two distinct purposes.
See Speed limits for more details
Some people use it to store information about the type of the speed limit for which the numeric value is given in maxspeed=*. This use is currently more common and has been in use longer. For example:
- 'sign' (to indicate that a sign indicates the exact speed in km/h or mph)
- 'IT:rural' (to indicate that the speed limit is the value currently legislated covering rural areas in Italy)
- 'DE:urban' (to indicate that the speed limit is the value currently legislated covering urban areas in German)
Others advocate the use of maxspeed:type=* for the above information and use this tag to hold information about how the data was collected. This second use matches more closely how other 'source' tags (such as source=*, source:name=*) are used. It also allows more detail to be captured, including the legal maximum speed as a numeric in maxspeed=*, the legal form for that speed limit (in maxspeed:type=* and and information about when and how the data was captured in this tag. Common values of this type include:
- 'survey' (the information was collected during a physical survey of the area)
- 'massgis' (the information was imported from a Massachusetts official database)
- 'Maximum␣Speed␣Limits"␣GIS␣data,␣updated␣August␣27,␣2011:␣http://www.dot.state.fl.us/planning/statistics/gis/roaddata.shtm' (the information was imported from US Federal data from the UL given on the date given)