boldtrn
If there is no access tagged, then there is no way for a routing engine to estimate if this barrier is accessible or not. The safe way is to assume it is not accessible. Since this gate is tagged on a secondary, I would assume either the road is not a secondary, or the gate is usually accessible. If it might be unaccessible three times per year for a short time, tagging access=yes should be fine IMHO and adding an access:conditional or a note explaining this.