Speed Limits:
All Freeway roads are complete.
Major Highways are 98% complete, look around to see if there are any missing SLs in your editing areas.
Minor Highway: 57%. Most rural state highways are generally 55 if you don't see it posted. Pay attention around junctions between other state highways for reduced limits or general signage.
Primary Street: 23 %
Street: 2.3%
Most rural counties generally do not post speed limits outside of incorporated/unincorporated cities/towns. Focus should be placed on more populated areas for PS unless you can find guidance for a county that says their default limit is X.