39 USC 5003: Establishment of post roads
Text contains those laws in effect on January 7, 2011
From Title 39-POSTAL SERVICEPART V-TRANSPORTATION OF MAILCHAPTER 50-GENERAL
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§5003. Establishment of post roads
The following are post roads:
(1) the waters of the United States, during the time the mail is carried thereon;
(2) railroads or parts of railroads and air routes in operation;
(3) canals, during the time the mail is carried thereon;
(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.