Proposing an new speed_limit_implied=yes tag for roads with default speed limits where for some reason mapper was unable to be more specific

[Mateusz_Konieczny]

@Kovoschiz

So what’s the difference with =implicit

maxspeed=implicit is currently not used as attribute on road lines

maxspeed:signed is also basically unused, with 189 uses worldwide

the new tag (or using say maxspeed=implicit) would be used

(maxspeed:signed is not ideal as some default speed limits are indirectly signed and implied - for example “end of built-up area” sign in absence of other speed limit signage defines speed limit)