[Tagging] maxspeed:signed=no - new proposed tag

Mateusz Konieczny matkoniecz at tutanota.com
Sun Jan 3 21:14:50 UTC 2021

Surveying maxspeed is clearly useful and relatively[1] simple.

But surveying and tagging cases where there is no signed maxspeed and
it default to what is specified by law is often problematic.

(1) we have no tag for "there is no maxspeed signage applying here"

(2) default maxspeed rules are often extremely complex

For example Poland has separate speed limits for
- vehicles below 3.5t
- vehicles with trailer or above 3.5t or trucks
- buses

(3) tagging exact max speed is often de facto impossible as it 
requires remembering that there are separate rules for

- dual carriageway with 2 or more lanes in each direction
- dual carriageway with 1 lane in each direction

- roundabout
- urban road that is not a roundabout
(El Salvador)

- road without asphalt or concrete surface
- road with asphalt or concrete surface in an unincorporated area

For more gory details https://wiki.openstreetmap.org/wiki/Default_speed_limits

(4) tagging exact speed limit info therefore requires both survey to confirm
that no signed speed limits applies and legal analysis (or using output of that)
and extra information. Right now mapper is supposed to do both in one step
what is not feasible.

Having "maxspeed:signed=no" to tag "there is no signed maxspeed here,
no speed limits signs, zoned speed limit does not apply, default
legal regulation apply" would allow sane survey that does not require
consulting local legislation to tag speed limits.

[1] speed limit zones, max speed differing depending on direction,
speed limits applying only to some vehicle types, speed limits
applying only on specific times etc all exist.
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