W3-5c · Truck Speed Zone Ahead
W3-5c Sizes & Dimensions
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. All dimensions below are in inches.
Open W3-5c Official Dimension Drawing (PDF, opens in a new tab)Official PDF · Opens in a new tab
Dimensions from the Official Drawing
Dimensions verified against the official drawing. Diamond dimensions are nominal side lengths. Select the required application size from the California manual, not simply the smallest available drawing.
- Official drawing size30" × 30"
Select using the applicable California sign-size table and actual roadway.
The smallest drawing size is not necessarily the permitted application size.
- Official drawing size36" × 36"
Select using the applicable California sign-size table and actual roadway.
The smallest drawing size is not necessarily the permitted application size.
- Official drawing size48" × 48"
Select using the applicable California sign-size table and actual roadway.
The smallest drawing size is not necessarily the permitted application size.
Drawing dimensions are not a universal minimum or an agency approval. 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.
California Application & Variants
The displayed truck speed is an example and must match the subsequent regulatory signing. California specifies the applicable M4-4P plaque or California R6-3/R6-4 signing where appropriate.
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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