I'm currently running a local copy of the nominatim maps of openstreetmap on PostGIS.
Is there a way i can get the speed limits into this database so i can return that information as well. I've found that this data is available when querying openstreetmap but require this to be returned locally
(I'm running our own local copy so i don't exceed there daily limits)
Best How To :
Probably yes, if you modify Nominatim accordingly. That is, importing speedlimit information (the maxspeed tag) into your database and adding it to query results. But there is no trivial way for just activating this feature.
Note that Nominatim is a geocoder and not made for querying all kinds of information from a OpenStreetMap database. For this tasks there are better solutions like Overpass API.