Hi Telemark,
Please do not change highway classifications unless you know what you are doing. NN-276 is a classified road. The official Nicaraguan classification is highway=tertiary
lanes=2
name=NN-276
ref=NN-276
smoothness=good
source:imagery=BingSat, ESRI, and other open satellite imagery available to OSM as of 2024
is "Colectora Principal".