Highway classifications in OSM are based on importance, and not necessarily physical characteristics. Indeed, most roads categorised as "Primær fylkesveg" in Norway should be highway=primary. This is a fairly important connection with the north side of Lungegårdsvatnet, and the central station. It is however a fair number of years since I drove a car in Bergen, so if you have up to date information about this section of road, there may very well be things that should be changed.