The department may delete and remove from the state highway secondary system of roads in any county any roads which are of low traffic importance and substitute therefor an equal, or less, mileage of other roads of higher traffic importance as determined by traffic surveys and estimates. Maintenance responsibility for roads deleted and removed from the state highway secondary system pursuant to the provisions of this section shall transfer from the jurisdiction of the department to the jurisdiction of the county or municipality in which such roads are situated, effective upon notice from the department of official action deleting and removing the roads from the state highway system.