R12-6 · Weight Limit (Specialized Hauling Vehicles)
R12-6 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 R12-6 Official Dimension Drawing (PDF, opens in a new tab)Official PDF · Opens in a new tab
Dimensions from the Official Drawing
Dimensions checked against the exact official drawing. California Table 2B-1 governs application-size selection; example weights do not establish a legal load limit.
- Official drawing size30" × 42"
Select using California Table 2B-1 and the actual roadway classification.
The smallest drawing size is not necessarily the permitted application size.
- Official drawing size36" × 48"
Select using California Table 2B-1 and the actual roadway classification.
The smallest drawing size is not necessarily the permitted application size.
- Official drawing size48" × 60"
Select using California Table 2B-1 and the actual roadway classification.
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
Keep the official vehicle symbols and axle-group labels. The single-unit 2–3, 4–5 and 6+ axle groups carry separate example loads; replace them only with the authorized limits.
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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