# Identification number display on placards.

**Citation:** 49 CFR 172.503  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

For procedures and limitations pertaining to the display of identification numbers on placards, see § 172.334.

[Amdt. 172-58, 45 FR 34701, May 22, 1980]

## Document text

For procedures and limitations pertaining to the display of identification numbers on placards, see § 172.334.

[Amdt. 172-58, 45 FR 34701, May 22, 1980]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-172.503>
- Source ID: `ecfr`
- SHA-256: `a8411686ae68b2e23a5eaba48fbc63435a230c1cc844c278c93752a8fcf3602e`
- Retrieved: 2026-08-20T05:45:59.130Z
- Exported: 2026-08-22T23:12:27.234Z
- Document slug: `49-cfr-172-503`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "172",
  "section": "172.503",
  "subpart": "Subpart F—Placarding",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```