Carnildo
It's currently tagged as "trunk" (high-speed, divided, few driveways or intersections).  Classifying it as "motorway" would require it to be built to Interstate standards (fully grade-separated), which the map shows isn't the case, while classifying it as "primary" would only be justified if there were large numbers of driveways or minor roads opening on to it.

Which re-classification do you think is appropriate, and why?