It is currently just a bit of asphalt on the ground. For it to be a trunk it would need to have lane markings, signs declaring it as such etc. It is also not abandoned, because it has never been a trunk. It was constructed like this and never put into service because further down a bridge is missing. The combination of highway=service, access=no for incomplete expressway sections is quite common in the map.
I added proposed:highway=trunk to indicate that it might one day become a trunk.