# § 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.
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**Source Credit**: (Pub. L. 91–375, Aug. 12, 1970, 84 Stat. 766.)
## Statutory Notes and Related Subsidiaries
### Effective Date
Section effective , pursuant to Resolution No. 71–9 of the Board of Governors. See , set out as a note preceding .