The following road construction activities do not require a permit from the Department: Road construction by the United States Government, or an agency thereof, incidental to construction or development on property under the jurisdiction of the United States Government; Road construction by the Maryland State Highway Administration in connection with the construction, improvement, or maintenance of a State road; Road construction by, or under, a permit or contract issued by an incorporated city, town, or village upon a municipal road under the jurisdiction of said city, town, or village; Road construction by a person working in conformance with a contract with the Department of Public Works and Transportation for construction, improvement, or maintenance; Activities pursuant to mandatory requirements for removal of snow and ice and incidental upkeep of sidewalks, entrances, and grass areas in the public right-of-way by, or on behalf of, the owner of abutting property; Placement of mailboxes, newspaper delivery boxes, and similar facilities, provided that they conform to standards established by the Department of Public Works and Transportation; Erection of temporary real estate directional signs in conformance with this Code; Activities for which the Director has granted a waiver.