Yep, looks like they increased the speed limit and OSMs speed limits and street imagery were out of date.

Those were the speed limit signs at Manakintown Ferry Road.  (37.5687002, -77.7121487).  If you refresh and edit the area you'll see I mapped the individual speed limit signs there.

I looked at the history.  You did increase the speed limit correctly.  I moved the transition point to match the signs and added the truck speed limit (maxspeed:hgv) to Huguenot Trail.

So this section of the map is better.  If you enjoy this you can find me and others on the OSM discord.