84 STAT. ]
PUBLIC LAW 91-375-AUG. 12, 1970
"(4) public roads, highways, and toll roads during the time the mail is carried thereon; and "(5) letter-carrier routes established for the collection and delivery of mail.
- § 5004. Discontinuance of service on post roads
"The Postal Service may discontinue service on a post road or part thereof when, in its opinion, the public interest so requires.
- "§ 5005. Mail transportation
" (a) The Postal Service may obtain mail transportation service—^ " (1) from common carriers by rail and motor vehicle or persons as provided in chapter 52 of this title; "(2) from air carriers as provided in chapter 54 of this title; "(3) from water carriers as provided in chapter 56 of this title; and "(4) by contract from any person (as defined in section 5201(7) of this title) or carrier for surface and water transportation under such terms and conditions as it deems appropriate, subject to the provisions of this section. " (b)(1) Contracts for the transportation of mail procured under Contracts. subsection (a)(4) of this section shall be for periods not in excess of 4 years (or where the Postal Service determines that special conditions or the use of special equipment warrants, not in excess of 6 years) and shall be entered into only after advertising a sufficient time previously for proposals. The Postal Service, with the consent of the holder of any such contract, may adjust the compensation allowed under that contract for increased or decreased costs resulting from changed conditions occurring during the term of the contract. "(2) A contract under subsection (a)(4) of this section may be Renewal. renewed at the existing rate by mutual agreement between the holder and the Postal Service. "(3) Any contract between the Postal Service and any carrier or inspection. person for the transportation of mail shall be available for inspection in the office of the Postal Service and either the Interstate Commerce Commission or the Civil Aeronautics Board, as appropriate, and in post offices on the post roads involved, as determined by the Postal Service, at least 15 days prior to the effective date of the contract. "(c) The Postal Service, in determining whether to obtain transportation of mail by carrier or person under subsection (a)(1) of this section, by contract under subsection (a)(4) of this section, or by Government motor vehicle, shall use the mode of transportation which best serves the public interest, due consideration being given to the cost of the transportation service under each mode. '^§ 5006. Lien on compensation of contractor " (a) A person who— "(1) performs service for a contractor or subcontractor in the transportation of mail; "(2) files his contract for service with the Postal Service; and " (3) files satisfactory evidence of performance with the Postal Service; shall have a lien on money due the contractor or subcontractor for the service. "(b) The Postal Service may pay the person establishing a lien Payment under subsection (a) of this section the sum due him, when the con- provisions* tractor or subcontractor fails to pay the person the amount of his lien within 2 months after the expiration of the month in which the
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