# Warning signs.

**Citation:** 49 CFR 193.2917  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) Warning signs must be conspicuously placed along each protective enclosure at intervals so that at least one sign is recognizable at night from a distance of 30m (100 ft.) from any way that could reasonably be used to approach the enclosure.

(b) Signs must be marked with at least the following 

## Document text

(a) Warning signs must be conspicuously placed along each protective enclosure at intervals so that at least one sign is recognizable at night from a distance of 30m (100 ft.) from any way that could reasonably be used to approach the enclosure.

(b) Signs must be marked with at least the following on a background of sharply contrasting color:

The words “NO TRESPASSING,” or words of comparable meaning.

[Amdt. 193-2, 45 FR 70409, Oct. 23, 1980, as amended at 47 FR 32720, July 29, 1982]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-193.2917>
- Source ID: `ecfr`
- SHA-256: `f7a9bc288fb53580070ac7e2d2ad4c5254a30370b407ad273fe2d1d85e4fd25a`
- Retrieved: 2026-08-20T05:54:35.243Z
- Exported: 2026-08-23T23:08:52.496Z
- Document slug: `49-cfr-193-2917`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "193",
  "section": "193.2917",
  "subpart": "Subpart J—Security",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```