From and after the date at which this act takes effect, the collection of tolls upon the Cumberland road shall cease, and all travel thereafter shall be free of toll. Any buildings belonging to the state, and heretofore used for toll-collectors' residences or offices, or any other purpose in connection of said road, may be maintained by the commissioner, aforesaid, and leased by him to any person employed, under the state highway department, upon said road, for residence purposes, or used for storing tools, appliances, et cetera; or, in case the same shall not, in the judgment of said commissioner, be required for any purpose connected with the said road, any such building may, by the said commissioner, be sold, after advertisement, to the highest responsible bidder, to be removed, if standing within the limits of the road, by the purchaser thereof.