# RADIOACTIVE placard.

- **operation:** document
- **citation:** 49 CFR 172.556
- **title:** RADIOACTIVE placard.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (a) Except for size and color, the RADIOACTIVE placard must be as follows:

(b) In addition to complying with § 172.519, the background color on the RADIOACTIVE placard must be white in the lower portion with a yellow triangle in the upper portion. The base of the yellow triangle must be 29 mm ±5 mm
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- **markdown:** https://regulus.evalyn.ai/document/49-cfr-172-556.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-172-556
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-172.556
**body:**

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

(b) In addition to complying with § 172.519, the background color on the RADIOACTIVE placard must be white in the lower portion with a yellow triangle in the upper portion. The base of the yellow triangle must be 29 mm ±5 mm (1.1 inches ±0.2 inches) above the placard horizontal center line. The symbol, text, class number and inner border must be black.

[Amdt. 172-123, 56 FR 66264, Dec. 20, 1991; Amdt. 172-130, 58 FR 51531, Oct. 1, 1993; 65 FR 58627, Sept. 29, 2000]
- **truncated:** false
- **body characters:** 546