D9-21 Text Telephone (TDD)
Identifies a text-telephone facility for people who use a telecommunications device for the deaf. It distinguishes that facility from a conventional voice telephone.
- Sign Name
- Text Telephone (TDD)
- MUTCD Code
- D9-21
- Sign Category
- Guide & Destination Signs
Specifications
- Shape
- Square
- Color / legend
- Blue background, white legend and symbol
Sizes & Dimensions (inches)
These are dimensions shown on the linked layout. Select the required size using the applicable MUTCD and agency requirements; the smallest drawing size is not necessarily the permitted minimum.
- Layout 124" × 24"
- Layout 230" × 30"
Placement Context
- Where it sits
- At the location appropriate to this guide-sign function; consult the linked manual and drawing for its application.
- CA MUTCD reference
- CA MUTCD 2026 Chapter 2I — General Service Signs
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Educational reference only. This is not an official Caltrans, FHWA, or local agency publication and is not legal or engineering advice. Always verify sign selection, size, placement, spacing, and application against the current CA MUTCD 2026, Caltrans sign specifications, Standard Plans, project documents, and the reviewing agency’s requirements. Local jurisdictions may impose additional requirements, and final selection, placement, and dimensions may require engineering judgment or agency approval. Reference editions: California MUTCD 2026 (effective January 18, 2026) and the Federal MUTCD 11th Edition with Revision 1.
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