# DANGEROUS placard.

**Citation:** 49 CFR 172.521  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Except for size and color, the DANGEROUS placard must be as follows:

(b) In addition to meeting the requirements of § 172.519, and appendix B to this part, the DANGEROUS placard must have a red upper and lower triangle. The placard center area and 1/2-inch (12.7 mm.) border must be white. The i

## Document text

(a) Except for size and color, the DANGEROUS placard must be as follows:

(b) In addition to meeting the requirements of § 172.519, and appendix B to this part, the DANGEROUS placard must have a red upper and lower triangle. The placard center area and 1/2-inch (12.7 mm.) border must be white. The inscription must be black with the 1/8-inch (3.2 mm.) border marker in the white area at each end of the inscription red.

[Amdt. 172-29, 41 FR 15996, Apr. 15, 1976, as amended by Amdt. 172-29A, 41 FR 40680, Sept. 20, 1976]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-172.521>
- Source ID: `ecfr`
- SHA-256: `0e00dfe5f1a6c047d5a9d3bfe21f7cc5d5168b3ef6c8519a2816beed6d8d34ec`
- Retrieved: 2026-08-20T05:45:59.130Z
- Exported: 2026-08-23T00:55:31.736Z
- Document slug: `49-cfr-172-521`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "172",
  "section": "172.521",
  "subpart": "Subpart F—Placarding",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```