R12-6 WEIGHT LIMIT (SPECIALIZED HAULING VEHICLES) Requirements
Application notes for R12-6 WEIGHT LIMIT (SPECIALIZED HAULING VEHICLES). The official manual distinguishes mandatory standards, recommended guidance, and optional applications; consult the linked sources for the provisions that apply.
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.
1. When WEIGHT LIMIT (SPECIALIZED HAULING VEHICLES) Is Used
Shows weight restrictions for specialized hauling vehicles, distinguishing single-unit axle groups and trailer configurations.
- Weight-restricted detour and hauling-route review
2. Placement and Application Notes
Position R12-6 at each end of the affected highway section or at the restricted structure, with advance notice allowing prohibited vehicles to detour or turn around..
- Place the sign where the intended road users have a clear, unobstructed view on approach.
- Use the mounting height and lateral placement specified for the sign and installation type.
- Use sign assemblies and supplemental plaques only as provided in the applicable manual and approved design.
3. Layout Sizes and Visibility Considerations
Linked-layout dimensions: 30" × 42"; 36" × 48"; 48" × 60". Check the applicable MUTCD and agency requirements for the required installation size.
- Choose size based on roadway speed, sight distance, and mounting location.
- Use the visibility and material requirements specified for this sign and installation.
4. Sign Selection Checks
- Match R12-6 to the exact intended restriction or route designation.
- 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.
- Select the size for the actual roadway and assembly using California Table 2B-1 and the responsible agency requirements.
Related Resources
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Verify R12-6 Requirements
This is an educational reference. Verify sign use, size, placement, and application against the current CA MUTCD, Caltrans sign specifications, Standard Plans, and the reviewing agency. Official source links are gathered in one place.
View official sourcesEducational 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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