# Signals.

**Citation:** 49 CFR 176.176  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

When Class 1 (explosive) materials are being loaded, handled, or unloaded on a vessel, the vessel must exhibit the following signals:

(a) By day, flag “B” (Bravo) of the international code of signals; and

(b) By night, an all-round fixed red light.

## Document text

When Class 1 (explosive) materials are being loaded, handled, or unloaded on a vessel, the vessel must exhibit the following signals:

(a) By day, flag “B” (Bravo) of the international code of signals; and

(b) By night, an all-round fixed red light.

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-176.176>
- Source ID: `ecfr`
- SHA-256: `97e5f2311fa70f9664de941cfd7f261cd70135fb9c39f3405e788fc98b7ced1d`
- Retrieved: 2026-08-20T05:46:14.489Z
- Exported: 2026-08-23T11:18:36.220Z
- Document slug: `49-cfr-176-176`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "176",
  "section": "176.176",
  "subpart": "Subpart G—Detailed Requirements for Class 1 (Explosive) Materials",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```