# Background requirements for certain placards.

- **operation:** document
- **citation:** 49 CFR 172.527
- **title:** Background requirements for certain placards.
- **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 square background required by § 172.510(a) for certain placards on rail cars, and § 172.507 for placards on motor vehicles containing a package of highway route controlled quantity radioactive materials, must be as follows:

(b) In addition to meeting the requireme
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- **markdown:** https://regulus.evalyn.ai/document/49-cfr-172-527.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-172-527
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-172.527
**body:**

(a) Except for size and color, the square background required by § 172.510(a) for certain placards on rail cars, and § 172.507 for placards on motor vehicles containing a package of highway route controlled quantity radioactive materials, must be as follows:

(b) In addition to meeting the requirements of § 172.519 for minimum durability and strength, the square background must consist of a white square measuring 14 1/4 inches (362.0 mm.) on each side surrounded by a black border extending to 15 1/4 inches (387.0 mm.) on each side.

[Amdt. 172-29, 41 FR 15996, Apr. 15, 1976, as amended by Amdt. 172-64, 46 FR 5316, Jan. 19, 1981; Amdt. 172-78, 48 FR 10226, Mar. 10, 1983]
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- **body characters:** 678