---
kind: "section"
citation: "49 C.F.R. § 172.556"
title: "49"
number: "172.556"
heading: "RADIOACTIVE placard."
url: "https://uscodex.org/cfr/49/172.556"
---

# §172.556. RADIOACTIVE placard.

- (a) Except for size and color, the RADIOACTIVE placard must be as follows:
- (b) In addition to complying with [§ 172.519](/cfr/49/172.519.md), 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.

## Notes

### Amendments

[Amdt. 172-123, 56 FR 66264, Dec. 20, 1991; Amdt. 172-130, 58 FR 51531, Oct. 1, 1993; 65 FR 58627, Sept. 29, 2000]

### Authority

Authority: 49 U.S.C. 5101-5128, 44701; 49 CFR 1.81, 1.96 and 1.97.

### Source

Source: Amdt. 172-29, 41 FR 15996, Apr. 15, 1976, unless otherwise noted.

### Amendments

[Amdt. 172-123, 56 FR 66264, Dec. 20, 1991; Amdt. 172-130, 58 FR 51531, Oct. 1, 1993; 65 FR 58627, Sept. 29, 2000]